Portuguese phonology

The phonology of Portuguese can vary considerably between dialects, in extreme cases leading to difficulties in intelligibility. This article focuses on the pronunciations that are generally regarded as standard. Since Portuguese is a pluricentric language, and differences between European Portuguese (EP) and Brazilian Portuguese (BP) can be considerable, both varieties are distinguished whenever necessary.

One of the most salient differences between European and Brazilian Portuguese is their prosody. European Portuguese is a stress-timed language, with reduction, devoicing or even deletion of unstressed vowels and a general tolerance of syllable-final consonants. Brazilian Portuguese, on the other hand, is of mixed characteristics, halfway to being a syllable-timed language, with:
 * a lighter reduction of unstressed vowels – less raising of pre-stress vowels, much less devoicing and absence of deletion, with the exception of unstressed when occurring word-finally after  or between  and  (in both cases the underlying presence of /i/ is reconstructible from the fact that  are affricated to  after /i/)
 * an increasing preference for open syllables, allowing only syllable-final sibilants, the affricate allophones and a coda rhotic, which is weakened in this position (see below)

Recent changes in Brazilian Portuguese are steadily eliminating closed syllables: coda nasals are deleted with concomitant nasalization of the preceding vowel, even in learned words; coda becomes  or, except for conservative velarization at the extreme south and rhotacism in remote rural areas in the center of the country; dialectal coda  ( in Europe, as well southern and western dialects) is often never trilled outside the fluminense area, instead appearing as one of the fricatives  (usually unvoiced except directly before a voiced consonant), and is usually deleted entirely when word-final in words with more than one syllable; and /i/ is epenthesized after almost all other coda-final consonants, with only a few clusters tolerated (e.g. consonant+, ). (Note that some rural "caipira" dialects pronounce the coda-final rhotic as, somewhat like in English.) This tends to produce words almost entirely composed of open syllables, e.g. advogado "lawyer"; McDonald's ; rock.

Some Brazilian dialects present phonological characteristics closer to those found in Europe (fluminense and florianopolitano, for instance, have a more strict vowel reduction, as does almost every Vernacular Brazilian speech when compared to the formal one, while fluminense and formal Brazilian Portuguese have a far greater tolerance to coda rhotic finals) though, while African and various rural, remote European Portuguese and Galician dialects often present characteristics commonly associated with Brazilian speech. For finer information on regional accents, see Portuguese dialects, and for historical sound changes see History of Portuguese.

Consonants
The consonant inventory of Portuguese is fairly conservative. The medieval Old Portuguese system of seven sibilants (,, , and apicoalveolar ) is still distinguished in spelling (intervocalic c/ç z x g/j ch ss s respectively), but is reduced to the four fricatives by the merger of  into  and apicoalveolar  into either  or  (depending on dialect and syllable position), except in parts of northern Portugal (most notably in the Trás-os-Montes region). Other than this, there have been no other significant changes to the consonant phonemes since Old Portuguese. However, several consonant phonemes have special allophones at syllable boundaries (often varying quite significantly between European and Brazilian Portuguese), and a few also undergo allophonic changes at word boundaries. Henceforward, the phrase "at the end of a syllable" can be understood as "before a consonant or at the end of a word".

Phonetic notes
 * In most of Brazil and Angola, the consonant hereafter denoted as is realized as a nasal palatal approximant, which nasalizes the vowel that precedes it:.
 * proposes that Portuguese possesses labio-velar stops and  as additional phonemes rather than sequences of a velar stop and.
 * The consonant hereafter denoted as has a variety of realizations depending on dialect. In Europe, it is typically a uvular trill ; however, a pronunciation as a voiced uvular fricative  may be becoming dominant in urban areas. There is also a realization as a voiceless uvular fricative, and the original pronunciation as an alveolar trill  also remains very common in various dialects. A common realization of the word-initial  in the Lisbon accent is a voiced uvular trill fricative . In Brazil,  can be velar, uvular, or glottal and may be voiceless unless between voiced sounds; it is usually pronounced as a voiceless velar fricative , a voiceless glottal fricative  or voiceless uvular fricative . See also Guttural R in Portuguese.
 * and are normally, as in English.  However, a number of dialects in northern Portugal pronounce  and  as apico-alveolar sibilants (sounding somewhat like a soft  or ), as in the Romance languages of northern Iberia.  A very few northeastern Portugal dialects still maintain the medieval distinction between apical and laminal sibilants (written s/ss and c/ç/z, respectively).
 * As a phoneme, only occurs in loanwords, with a tendency for speakers to substitute in . However,  is an allophone of  before  in a number of Brazilian dialects.  Similarly,  is an allophone of  in the same contexts.
 * In northern and central Portugal, the voiced stops, , are usually lenited to fricatives , , and  respectively, except at the beginning of words, or after nasal vowels; a similar process occurs in Spanish.

Further notes

 * Although nasal consonants do not normally occur at the end of syllables, syllable-final may be present in rare learned words, such as abdómen ( 'abdomen'). In Brazilian varieties, these words have a nasal diphthong . Word-initial  occurs in very few loanwords.
 * While the sibilant consonants contrast word-initially and intervocalically, they appear in complementary distribution in the syllable coda.  For many dialects (i.e. those of Portugal and of Rio de Janeiro and certain adjoining areas in Brazil), the sibilant is a postalveolar in coda position (e.g. pasto  "pasture"; -ismo  "-ism"; paz  "peace").  In many other dialects of Brazil (e.g. some of the Southeast, Northeast, and North), the postalveolar variant occurs in some or all cases when directly preceding a consonant, including across word boundaries, but not word-finally (e.g., , ). In a number of Brazilian dialects, this "palatalization" is absent entirely (e.g. , , ), like that of São Paulo, those of the Southern dialects and some Northern and Northeastern dialects.  Voicing contrast is also neutralized, with  or  occurring before voiced consonants and  or  appearing before voiceless consonants and before a pause (e.g. pasta  or , 'paste'; Islão (or Islã)  or , 'Islam').  In European dialects, the postalveolar fricatives are only weakly fricated in the syllable coda.
 * The consonant is velarized in European dialects. In most Brazilian dialects (as well in certain rural Portuguese regions, especially Minho and Madeira),  is vocalized to  or  at the end of syllables, but in the dialects of the extreme south, mainly along the frontiers with other MercoSur countries (especially Uruguay), it has the full pronunciation or the velarized pronunciation. In some caipira registers, there is a rhotacism of coda  to retroflex . In casual BP, unstressed il can be realized as, as in fácil  ('easy').
 * For speakers who realize as an alveolar trill, the sequence  (as in e.g. os rins) can coalesce into a voiced alveolar trill fricative.

Consonant elision
There is a variation in the pronunciation of the first consonant of certain clusters, most commonly C or P in cç, ct, pç and pt. These consonants may be variably elided or conserved. For some words, this variation may exist inside a country, sometimes in all of them; for others, the variation is dialectal, with the consonant being always pronounced in one country and always ellided in the other. This variation affects 0,5% of the language's vocabulary, or 575 words out of 110,000. In most cases, Brazilians variably conserve the consonant while speakers elsewhere have invariably ceased to pronounce it (for example, dete(c)tor in Brazil versus detetor in Portugal). The inverse situation is rarer, occurring in words such as fa(c)to and conta(c)to (consonants never pronounced in Brazil, pronounced elsewhere). Until 2009, this reality could not be apprehended from the spelling: while Brazilians did not write consonants that were no longer pronounced, the spelling of the other countries retained them in many words as silent letters, usually when there was still a vestige of their presence in the pronunciation of the preceding vowel. This could give the false impression that European Portuguese was phonologically more conservative in this aspect, when in fact it was Brazilian Portuguese that retained more consonants in pronunciation.

Allophones of laminal denti-alveolar stops
Unlike its neighbor and relative Spanish, Portuguese lacks a tendency to elide any stop, including those that may become a continuant (always fricative in Portuguese) by lenition ( >, > ,  > ), but it has a number of allophones to it.

In most Brazilian dialects, including the overwhelming majority of the registers of Rio de Janeiro (from where this process is said to have expanded to elsewhere in Brazil), other fluminense-speaking areas, and São Paulo, as well some rural areas of Portugal, the dental stops are affricated to and  before,  and. This is not the case with some Northeastern and Southern Brazilian dialects. Even if unstressed rhyme or  is deleted as often,  will still affricate (in people with the alveolo-palatal allophone, such as most cariocas, deletion of the vowel may be more common). Post-alveolar affricates also appear in loanwords from languages such as English, Spanish and Japanese (though it is common in Portugal to merge them with the post-alveolar sibilants, as was done with the former native affricate sounds in the Middle Ages).

Likewise, in the totality of dialects of both Portugal and Brazil, an elided (or ) or unstressed  before another one (that actually becomes  in Portugal), stressed one, leads to sandhi, and new affricates will appear. It is also a feature of a phonologically closely related language, Catalan. This is specially common in Portugal and areas of increasing acceptance of and adhesion to affricate allophones for the denti-alveolar stops, such as Southern and Northeastern Brazil, where palatalization is traditionally much less common, though despite being consistently palatalizing (100% of registers given in the mentioned researches, against 4% of Recife, Pernambuco), it is also common in fluminense, perhaps because of its European-influenced stress-timing affecting nearly all unstressed vowels. Alveolar affricates also appear in loanwords from languages such as Japanese, Italian and German.

Finally, Vernacular Brazilian Portuguese, unlike its Cultivated counterpart, has laminal denti-alveolar nasal (same place of articulation of its ) as a trisyllable and polysyllable allophone of  after nasal vowels (for example, in the gerund). While uncommon in Europe, many South American and African languages do not possess a phonemic distinction between voiced occlusives and nasal stops (but it is unclear if it was what influenced the development of Brazilian Portuguese). It is as pervasive as the deletion of rhyme (when the plural is already indicated by the article) and  ~, but much more stigmatized.

Rhotics
The two rhotic phonemes and  contrast only between vowels. Elsewhere, their occurrence is predictable by context, with dialectal variations in realization. The rhotic is "hard" (i.e. ) in the following circumstances: It is "soft" (i.e. ) when it occurs in syllable onset clusters (e.g. atributo ).
 * Word-initial;
 * Syllable-initial preceded by (only in Europe) or  (e.g. palra,, or Israel, European , Brazilian   etc.);
 * Following a nasal vowel (e.g. honrar "to honor" European, Brazilian   etc.);
 * In most Brazilian and some African dialects, syllable-finally (i.e. preceded but not followed by a vowel).

The realization of the "hard" rhotic varies significantly across dialects. The "reference" pronunciation is commonly found in Portugal, although some Portuguese dialects maintain the traditional trill pronunciation, as in Spanish. In Brazil, there is significant variation, with many dialects showing two or three allophones.

This restricted variation has prompted several authors to postulate a single rhotic phoneme. and see the soft as the unmarked realization and that instances of intervocalic  result from gemination and a subsequent deletion rule (i.e. carro  >  > ). Similarly, argue that the hard is the unmarked realization.

Brazilian rhotics
In addition to the phonemic variation between and  between vowels, up to four allophones of the "merged" phoneme /R/ are found in other positions:
 * 1) A "soft" allophone in syllable-onset clusters, as described above;
 * 2) A default "hard" allophone in most other circumstances;
 * 3) In some dialects, a special allophone syllable-finally (i.e. preceded but not followed by a vowel);
 * 4) Commonly in all dialects, deletion of the rhotic word-finally.

The default hard allophone is some sort of voiceless fricative in most dialects, e.g. etc., although other variants are also found (e.g. a trill  in certain conservative dialects down São Paulo, of Italian-speaking, Spanish-speaking, Arabic-speaking or Slavic-speaking influence, and the other trill  in areas of German-speaking, French-speaking and Portuguese-descended influence throughout coastal Brazil down Espírito Santo, most prominently Rio de Janeiro).

The syllable-final allophone shows the greatest variation:
 * Many dialects use the same voiceless fricative as in the default allophone. This may become voiced before a voiced consonant, esp. in its weaker variants (e.g. dormir  "to sleep").
 * The soft occurs for many speakers in Southern Brazil and São Paulo city.
 * An English-like approximant or vowel  occurs elsewhere in São Paulo as well as Mato Grosso do Sul, southern Goiás, central and southern Mato Grosso and bordering regions of Minas Gerais. This pronunciation is stereotypically associated with the rural "caipira" dialect.

Throughout Brazil, deletion of the word-final rhotic is common, regardless of the "normal" pronunciation of the syllable-final allophone. This pronunciation is particularly common in lower registers, although found in most registers in some areas, e.g. Northeast Brazil, and in the more formal and standard sociolect. It occurs especially in verbs, which always end in R in their infinitive form; in words other than verbs, the deletion is rarer and seems not to occur in monosyllabic non-verb words, such as mar. Evidence of this allophone is often encountered in writing that attempts to approximate the speech of communities with this pronunciation, e.g. the rhymes in the popular poetry (cordel literature) of the Northeast and phonetic spellings (e.g. amá, sofrê in place of amar, sofrer) in Jorge Amado's novels (set in the Northeast) and Gianfrancesco Guarnieri's play Eles não usam black tie (about favela dwellers in Rio de Janeiro). For example, amar is in European Portuguese, but  in Brazilian Portuguese. Note that even in dialects that consistently delete word-final rhotics, syllable-final rhotics within a word are still maintained, e.g. dormir etc.

The soft realization is often maintained across word boundaries in close syntactic contexts (e.g. mar azul "blue sea" or por isso  "therefore" lit. "because of this").

"Hard" variants are also found in the syllable coda in conservative non-European non-Brazilian dialects, such as African ones; deletion of the word-final rhotic is also common in African dialects, especially among second-language speakers.

Vowels
Portuguese has one of the richest vowel phonologies of all Romance languages, having both oral and nasal vowels, diphthongs, and triphthongs. A phonemic distinction is made between close-mid vowels and the open-mid vowels, unlike in Spanish, though there is a certain amount of vowel alternation. European Portuguese has also two near-central vowels, one of which tends to be elided like the e caduc of French.

Like standard Catalan, Portuguese uses vowel height to contrast stressed syllables with unstressed syllables; the vowels tend to be raised to  (although  occurs only in EP) when they are unstressed (see below for details). The dialects of Portugal are characterized by reducing vowels to a greater extent than others. Falling diphthongs are composed of a vowel followed by one of the high vowels or ; although rising diphthongs occur in the language as well, they can be interpreted as hiatuses.

The exact realization of the varies somewhat amongst dialects. In Portugal, it is pronounced higher than in Brazil, approaching the mid-central vowel (see charts to the left).

In Brazil, and  occur in complementary distribution:  occurs in final unstressed syllables and in stressed syllables before one of the nasal consonants, , or  followed by another vowel, and  elsewhere. In European Portuguese, the general situation is similar (with being more prevalent in nearly all unstressed syllables), except that in some regions the two vowels form minimal pairs. Many of these are composed of a stressed word and an unstressed clitic, such as dá "he gives" and da "of the". Others are verb forms of the first conjugation such as pensamos "we think" and pensámos "we thought" (pensamos in Brazil).

Close-mid vowels and open-mid vowels ( and ) contrast only when they are stressed. In unstressed syllables, they occur in complementary distribution. In Brazilian Portuguese, they are raised to a high or near-high vowel ( and, respectively) after a stressed syllable, or in some accents and in general casual speech, also before it.

European Portuguese possesses a near-close near-back unrounded vowel. It occurs in unstressed syllables such as in pegar ('to grip'). There is no standard symbol in the International Phonetic Alphabet for this sound. The IPA Handbook transcribes it as, but in Portuguese studies or  is traditionally used. There are very few minimal pairs for this sound, and in relaxed pronunciation it is often elided. Some examples include pregar ('to nail') vs. pregar  ('to preach'; the latter stemming from earlier preegar < Latin ), sê  ('be!') vs. sé  ('Sé') vs. se  ('if'), and pêlo  ('hair') vs. pélo  ('I peel off') vs. pelo  ('for the').

Oral diphthongs
Diphthongs are not considered independent phonemes in Portuguese, but knowing them can help with spelling and pronunciation.

There are also some words with two vowels occurring next to each other like in iate and sábio may be pronounced both as rising diphthongs or hiatus.

The characteristic pronunciation of as  at the end of syllables in Brazilian Portuguese has created new diphthongs:  (sal, "salt"),  (mel, "honey"),  (mil, "thousand"),  (polvo, "octopus"),  (sol, "sun"),  (sul, "south"); this semivowel [w] is best analyzed as an allophone of the consonant  at the end of syllables.

Nasal vowels
Portuguese also has a series of nasalized vowels. analyzes European Portuguese with five monophthongs and four diphthongs, all phonemic:. Nasal diphthongs occur mostly at the end of words (or followed by a final sibilant), and in a few compounds.

analyze the nasalized monophthongs of São Paulo Brazilian Portuguese as phonetically nasalized before an archiphoneme or a heterosyllabic nasal consonant. Nasalized diphthongs in this variant of Brazilian Portuguese are formed by combining, , , or with the offglide  (except with ).

Nasal diphthongs
Most times nasal diphthongs occur at the end of the word. They are:


 * -ão or -am. . Examples: pão (bread), cão (dog), estão (they are), vão (they go), limão (lemon), órgão (organ), Estêvão (Steven). When in the -am form they are always the 3rd person of the plural of a "-ar" verb, like "estavam" (they were), "contam" (they account), "casam" (they marry).
 * -ãe It occurs only in mãe(s) (mother(s)) and in the plural of some of the words ending in -ão, e.g. cães (dogs), pães (breads)
 * -õe . It occurs:
 * on the 2nd person of the singular of the pôr verb and its derivatives, always followed by an s like pões, opões, compões, pressupões;
 * on the 3rd person of the singular of the pôr verb and its derivatives like põe, opõe, compõe, pressupõe;
 * in the plural of many of the words ending in-ão, e.g. limões (lemons), anões (dwarfs), espiões (spies), glutões, colhões (slang for testicles), iões (ions), catiões (cations), aniões (anions), electrões (electrons), neutrões (neutrons), protões (protons), fotões (photons), positrões (positrons) words
 * -uim or -uin Examples: pinguim (penguin), ruim (bad), ruindade (badness).

Nasal triphthongs
They occur only in EP. In BP, they are always pronounced in two syllables.
 * -iam . It occurs:
 * in the 3rd person of the plural of the present of some "-iar" terminated verbs as in "adiam" (they procrastinate)
 * in the 3rd person of the plural of the imperfect past of "ir" (to go) verb as in "iam" (they went)
 * in the 3rd person of the plural of the conditional of all verbs like dariam (they would give), seriam (they would be), iriam (they would go), poriam (they would put)
 * -oam . It occurs in the 3rd person of the plural in the 3rd person of the plural of the imperfect past of "ir" (to go) verb as in "iam" (they went)verbs like voam (they fly), doam (they donate), coam, toam, zoam
 * -uam or "-uão" . It occurs on the suão (Southern hot wind) word and in the 3rd person of the plural of the "-uar" terminated verbs like suam (they sweat), aguam, desaguam

Nasal tetraphthongs
They occur only in EP. In BP, they are always pronounced in two syllables.


 * -aiam in the 3rd person of the plural of the present of -aiar terminated verbs as in caiam and vaiam


 * -eiam in the 3rd person of the plural of the present of some-ear terminated verbs as in estreiam and escamoteiam


 * -iem in the 3rd person of the plural of the present of subjuntive of some "-iar" terminated verbs as in "vaiem" (that they procrastinate)


 * -õem It is pronounced like a hiatus and occurs on the 3rd person of the plural of the pôr verb and its derivatives like põem, opõem, compõem, pressupõem;

Vowel alternation
The stressed relatively open vowels contrast with the stressed relatively close vowels  in several kinds of grammatically meaningful alternation:


 * Between the base form of a noun or adjective and its inflected forms: ovo "egg", ovos  "eggs"; novo, nova , novos , novas  "new" (masculine singular, feminine singular, masculine plural, feminine plural);
 * Between some nouns or adjectives and related verb forms: adj. seco "dry", v. seco  "I dry"; n. gosto  "taste", v. gosto  "I like"; n. governo  "government" v. governo  "I govern";
 * Between different forms of some verbs: pôde "he could", pode  "he can";
 * Between some pairs of related words: avô "grandfather", avó  "grandmother";
 * In regular verbs, the stressed vowel is normally low, but high before the nasal consonants , ,  (the high vowels are also nasalized, in BP);
 * Some stem-changing verbs alternate stressed high vowels with stressed low vowels in the present tense, according to a regular pattern: cedo, cedes, cede, cedem ; movo, moves, move, movem (present indicative); ceda, cedas, ceda, cedam ; mova, movas, mova, movam  (present subjunctive). (There is another class of stem-changing verbs which alternate  with  according to the same scheme);
 * In central Portugal, the 1st. person plural of verbs of the 1st. conjugation (with infinitives in -ar) has the stressed vowel in the present indicative, but  in the preterite, cf. pensamos "we think" with pensámos "we thought". In BP, the stressed vowel is  in both, so they are written without accent mark.

There are also pairs of unrelated words that differ in the height of these vowels, such as besta "beast" and besta  "crossbow"; mexo  "I move" and mecho  "I highlight (hair)"; molho  "sauce" and molho  "bunch"; corte  "(a) cut" and corte  "court"; meta  "I put (subjunctive)" and meta  "goal"; and (especially in Portugal) para  "for" and para  "he stops". Since most polysyllabic homographs of this sort can be distinguished from context, the orthography does not differentiate them, with the exception of, optionally, fôrma "mold" and forma "shape".

There are several minimal pairs in which a clitic containing the vowel contrasts with a monosyllabic stressed word containing : da vs. dá, mas vs. más, a vs. à, etc. In BP, however, these words may be pronounced with  in some environments.

Unstressed vowels
Some isolated vowels (meaning those that are neither nasal nor part of a diphthong) tend to change quality in a fairly predictable way when they become unstressed. In the examples below, the stressed syllable of each word is in boldface. The term "final" should be interpreted here as "at the end of a word or before word-final -s".

With a few exceptions mentioned in the previous sections, the vowels and  occur in complementary distribution when stressed, the latter before nasal consonants followed by a vowel, and the former elsewhere.

In Brazilian Portuguese, the general pattern in the southern and western accents is that the stressed vowels, , neutralize to , , , respectively, in unstressed syllables, as is common in Romance languages. In final unstressed syllables, however, they are raised to, ,. In casual BP (as well in the fluminense dialect),, may be raised to ,  on any unstressed syllable, as long as it has no coda.

European Portuguese has taken this process one step further, raising, , to , ,  in all unstressed syllables. The vowels and  are also more centralized than their Brazilian counterparts. The three unstressed vowels are reduced and often voiceless, and in some cases elided in fast speech.

There are some exceptions to the rules above. For example, occurs instead of unstressed  or, before another vowel in hiatus (t e atro, r e úne, p e ão). Also,, or  appear in some unstressed syllables, in EP. And there is some dialectal variation in the unstressed sounds: the northern and eastern accents of BP have low vowels in unstressed syllables,, instead of the high vowels. However, the Brazilian media tends to prefer the southern pronunciation. In any event, the general paradigm is a useful guide for pronunciation and spelling.

Nasal vowels, vowels that belong to falling diphthongs, and the high vowels and  are not affected by this process, nor is the vowel  when written as the digraph $⟨ou⟩$. Nevertheless, casual BP may raise unstressed nasal vowels, to , , too.

Epenthesis
In BP, an epenthetic vowel is sometimes inserted between consonants, to break up consonant clusters that are not native to Portuguese, in learned words and in borrowings. This also happens at the ends of words after consonants that cannot occur word-finally (e.g., , ). For example, psicologia ('psychology') may be pronounced ; adverso ('adverse') may be pronounced ; McDonald's may be pronounced ; and both rock and hockey are typically pronounced. In northern Portugal, an epenthetic may be used instead,, , but in southern Portugal there is often no epenthesis, ,. Epenthesis at the end of a word does not normally occur in Portugal.

The native Portuguese consonant clusters, where there is not epenthesis, are sequences of a non-sibilant oral consonant followed by the liquids  or, and the complex consonants. Some examples:

flagrante, complexo , fixo (but not ficção ), latex , quatro , guaxinim

Further notes on the oral vowels

 * Some words with in EP have  in BP. This happens when those vowels are stressed before the nasal consonants, , followed by another vowel, in which case both types of vowel may occur in European Portuguese, but Brazilian Portuguese only allows high vowels. This can affect spelling: cf. EP tónico, BP tônico "tonic".
 * In BP, stressed vowels have nasal allophones,, , etc. (see below) before one of the nasal consonants , , , followed by another vowel. In EP, nasalization is nearly absent in this environment.
 * Some BP speakers also diphthongize stressed vowels to, , , etc. (except ), before a sibilant at the end of a stressed syllable (written s, x, or z). For instance, Jesus "Jesus", faz  "he does", dez  "ten". This has led to the use of meia (meaning "meia dúzia", or "half a dozen") for seis  "six" when making enumerations, to avoid any confusion with três  "three" on the telephone.
 * In Lisbon and surrounding areas, stressed is pronounced  or  when it comes before a palatal consonant,  or a palato-alveolar , , followed by another vowel.
 * In EP, if two adjacent syllables have the vowel as their vowel, the first  vowel is often realized as : m'nistro, F'lipe, d'ficuldade. There are, however, many exceptions (f'nito), as well as some variation (d'fícil or d'fícil). A similar (but more widespread) phenomenon affects this vowel when it occurs in unstressed syllables and immediately before palatal or post-alveolar consonants: f'lhote, m'nhoca, b'chano, t'jolo. It also occurs before fricative codas (which are post-alveolar in EP): dstância.

Sandhi
When two words belonging to the same phrase are pronounced together, or two morphemes are joined in a word, the last sound in the first may be affected by the first sound of the next (sandhi), either coalescing with it, or becoming shorter (a semivowel), or being deleted. This affects especially the sibilant consonants, , , , and the unstressed final vowels , ,.

Consonant sandhi
As was mentioned above, the dialects of Portuguese can be divided into two groups, according to whether syllable-final sibilants are pronounced as postalveolar consonants, or as alveolar ,. At the end of words, the default pronunciation for a sibilant is voiceless,, but in connected speech the sibilant is treated as though it were within a word (assimilation):


 * If the next word begins with a voiceless consonant, the final sibilant remains voiceless ; bons tempos or  "good times".
 * If the next word begins with a voiced consonant, the final sibilant becomes voiced as well ; bons dias or  "good days".
 * If the next word begins with a vowel, the final sibilant is treated as intervocalic, and pronounced ; bons amigos or  "good friends".

When two identical sibilants appear in sequence within a word, they reduce to a single consonant. For example, nascer, desço, excesso, exsudar are pronounced with by speakers who use alveolar sibilants at the end of syllables, and disjuntor is pronounced with  by speakers who use postalveolars. But if the two sibilants are different they may be pronounced separately, depending on the dialect. Thus, the former speakers will pronounce the last example with, whereas the latter speakers will pronounce the first examples with if they are from Brazil or  if from Portugal (although in relaxed pronunciation the first sibilant in each pair may be dropped). This applies also to words that are pronounced together in connected speech:
 * sibilant +, e.g. as sopas: either or ;
 * sibilant +, e.g. as zonas: either or ;
 * sibilant +, e.g. as chaves: either or ;
 * sibilant +, e.g. os genes: either or.

Vowel sandhi
Normally, only the three vowels, (in BP) or  (in EP), and  occur in unstressed final position. If the next word begins with a similar vowel, they merge with it in connected speech, producing a single vowel, possibly long (crasis). Here, "similar" means that nasalization can be disregarded, and that the two central vowels can be identified with each other. Thus,


 * + → ; toda a noite  or  "all night", nessa altura  or  "at that point".
 * + →  (note that this low nasal vowel appears only in this situation); a antiga "the ancient one" and à antiga "in the ancient way", both pronounced  or.
 * + → ; de idade  or  "aged".
 * + → ; fila de espera  "waiting line" (EP only).
 * + → ; todo o dia  or  "all day".

If the next word begins with a dissimilar vowel, then and  become approximants in Brazilian Portuguese (synaeresis):


 * + V → ; durante o curso "during the course", mais que um  "more than one".
 * + V → ; todo este tempo "all this time" do objeto  "of the object".

In careful speech and in with certain function words, or in some phrase stress conditions (see Mateus and d'Andrade, for details), European Portuguese has a similar process:


 * + V → ; se a vires "if you see her", mais que um  "more than one".
 * + V → ; todo este tempo "all this time", do objecto  "of the object".

But in other prosodic conditions, and in relaxed pronunciation, EP simply drops final unstressed and  (elision):


 * + V → ; durante o curso "during the course", este inquilino  "this tenant".
 * + V → ; todo este tempo "all this time", disto há muito  "there's a lot of this".

Unlike French, for example, Portuguese does not indicate most of these sound changes explicitly in its orthography.

Stress
Primary stress may fall on any of the three final syllables of a word, but mostly on the last two. There is a partial correlation between the position of the stress and the final vowel; for example, the final syllable is usually stressed when it contains a nasal phoneme, a diphthong, or a close vowel. The orthography of Portuguese takes advantage of this correlation to minimize the number of diacritics.

Because of the phonetic changes that often affect unstressed vowels, pure lexical stress is less common in Portuguese than in related languages, but there is still a significant number of examples of it:


 * dúvida "doubt" (noun) vs. duvida  "he doubts"
 * ruíram "they collapsed" vs. ruirão  "they will collapse"
 * falaram "they spoke" vs. falarão  "they will speak" (Brazilian pronunciation)
 * ouve "he hears" vs. ouvi   "I heard" (Brazilian pronunciation)
 * túnel "tunnel" vs. tonel  "wine cask" (European pronunciation)

Prosody
Tone is not lexically significant in Portuguese, but phrase- and sentence-level tones are important. There are six dynamic tone patterns that affect entire phrases, which indicate the mood and intention of the speaker such as implication, emphasis, reservation, etc. As in most Romance languages, interrogation on yes-no questions is expressed mainly by sharply raising the tone at the end of the sentence.