One of the features that give Portuguese its distinctive sound — and the one most often missed by learners — is its rich system of nasal vowels: vowels produced with air flowing through both mouth and nose. English has none (nasalization in English is a subtle coloring before n or m, not a distinct sound). French has four (bon, fin, pain), which gives French speakers a head start. Portuguese goes further: five nasal vowels, four nasal diphthongs, and a whole category of -ão plurals with its own rules.
Missing the nasal is a meaningful error. Vim [vĩ] means "I came"; vi [vi] means "I saw." São [sɐ̃w] means "they are"; sou [so] means "I am." Failure here is miscommunication, not accent.
The five nasal vowels
European Portuguese has five nasal vowel phonemes, one for each vowel position. They are marked in spelling either directly (with a tilde over a or o), or indirectly (by a following m or n in the same syllable — in which case the m/n is not separately pronounced, it simply colors the vowel).
| Nasal | IPA | Oral counterpart | Example | Translation |
|---|---|---|---|---|
| ã | [ɐ̃] | [ɐ] | irmã, campo | sister, field |
| em / en | [ẽ] | [e] | tempo, vento | time/weather, wind |
| im / in | [ĩ] | [i] | fim, índio | end, indigenous person |
| õ / om / on | [õ] | [o] | bom, monte | good, hill |
| um / un | [ũ] | [u] | um, junto | a/one, together |
A minha irmã chega amanhã de comboio.
My sister arrives tomorrow by train. (irmã [iɾˈmɐ̃], amanhã [ɐmɐˈɲɐ̃])
Tudo bem? Sim, vou bem obrigada.
Is everything OK? Yes, I'm well, thank you. (bem [bɐ̃j] — note that word-final -em is actually a nasal diphthong [ɐ̃j], not plain [ẽ])
Não encontro o fim deste livro.
I can't find the end of this book. (fim [fĩ])
Põe o casaco, está frio lá fora.
Put on your coat, it's cold outside. (põe [põj])
Um café, um pastel de nata e está tudo.
One coffee, one pastel de nata, and that's all. (um [ũ])
Orthographic rules — recognizing nasal vowels in writing
There are two orthographic signals for nasal vowels in Portuguese.
Signal 1: The tilde. Appears only on a and o. Always marks nasality.
- ã maçã, manhã, lã*
- õ in diphthongs õe and ões: põe, limões, lições
Signal 2: A following m or n in the same syllable. The consonant letter is a silent nasality marker — it is not pronounced as a separate segment. It merely signals that the preceding vowel is nasal. Crucially, this only applies when m or n closes a syllable (is followed by another consonant, or ends the word). When m or n begins a syllable with a following vowel (as in pano, sino, banana), it pronounces fully as [m] or [n] and the preceding vowel stays oral.
- am, an → antes, banco* → [ˈkɐ̃pu], [ˈɐ̃tɨʃ], [ˈbɐ̃ku]
- em, en → vento, entrar* → [ˈtẽpu], [ˈvẽtu], [ẽˈtɾaɾ]
- im, in → índio, ínfimo* → [fĩ], [ˈĩdju], [ˈĩfimu]
- om, on → ponto, compor* → [bõ], [ˈpõtu], [kõˈpoɾ]
- um, un → junto, untar* → [ũ], [ˈʒũtu], [ũˈtaɾ]
O campo está cheio de flores.
The field is full of flowers. (campo [ˈkɐ̃pu] — the m is not pronounced; it just nasalizes the a)
O tempo em Lisboa é normalmente agradável.
The weather in Lisbon is usually pleasant. (tempo [ˈtẽpu], em [ɐ̃j])
When is m/n pronounced and when does it just nasalize?
| Pattern | Behaviour | Example |
|---|---|---|
| V + m/n + V (consonant between vowels) | m/n pronounced | caminho [kɐˈmiɲu], banana [bɐˈnɐnɐ] |
| V + m/n + C (end of syllable) | m/n silent, vowel nasalized | campo [ˈkɐ̃pu], conto [ˈkõtu] |
| V + m/n word-final | m/n silent, vowel nasalized | fim [fĩ], bom [bõ] |
O caminho para casa é longo.
The way home is long. (caminho [kɐˈmiɲu] — the m is between vowels, fully pronounced)
O campo do Estádio da Luz é enorme.
The Estádio da Luz pitch is huge. (campo [ˈkɐ̃pu] — m silent, nasalizes a)
Nasal diphthongs — the famous -ão
A nasal diphthong is a nasal vowel followed by a nasal glide. Portuguese has four main ones, and the most famous is -ão, the most common nasal ending in the language.
| Diphthong | IPA | Example | Translation |
|---|---|---|---|
| ão | [ɐ̃w] | pão, mão, não, coração | bread, hand, no, heart |
| ãe | [ɐ̃j] | mãe, pães, cães, capitães | mother, loaves, dogs, captains |
| õe | [õj] | põe, limões, lições, razões | puts, lemons, lessons, reasons |
| ui (in muito) | [ũj] | muito | very, a lot |
A mãe do meu amigo faz o melhor pão de Lisboa.
My friend's mother makes the best bread in Lisbon. (mãe [mɐ̃j], pão [pɐ̃w])
Os meus avós têm dois cães enormes.
My grandparents have two huge dogs. (cães [kɐ̃jʃ])
Ele põe açúcar no café.
He puts sugar in his coffee. (põe [põj])
Gosto muito de caminhar à beira-mar.
I really like walking by the sea. (muito [ˈmũjtu] — the i is nasalized despite no tilde or m/n, a historical inheritance from Latin multum)
The curious case of muito
The word muito is written with no tilde and no m/n in the nasalized syllable, yet the i is nasal — [ˈmũjtu]. This is a historical inheritance: the word comes from Latin multum, and the u nasalized the following i before the spelling was standardized. Every native speaker nasalizes the i in muito; a pronunciation [ˈmujtu] without nasalization sounds foreign. Treat it as an exception to memorize.
Muito obrigada pela ajuda, gostei muito do jantar.
Thanks a lot for the help, I really enjoyed the dinner. (muito [ˈmũjtu] — always nasal i)
The three patterns for plural of -ão nouns
One of the most famous — and feared — features of Portuguese morphology is that singular -ão nouns form their plurals in three different ways, with no fully predictable rule. Learners must memorize each word's plural.
| Singular | Plural | Pattern | Meaning |
|---|---|---|---|
| pão | pães | -ão → -ães | bread → loaves |
| cão | cães | -ão → -ães | dog → dogs |
| capitão | capitães | -ão → -ães | captain → captains |
| coração | corações | -ão → -ões | heart → hearts |
| lição | lições | -ão → -ões | lesson → lessons |
| razão | razões | -ão → -ões | reason → reasons |
| mão | mãos | -ão → -ãos | hand → hands |
| irmão | irmãos | -ão → -ãos | brother → siblings |
| cidadão | cidadãos | -ão → -ãos | citizen → citizens |
Comprei dois pães e uma dúzia de ovos.
I bought two bread rolls and a dozen eggs. (pães [pɐ̃jʃ])
As lições de piano são aos sábados de manhã.
The piano lessons are on Saturday mornings. (lições [liˈsõjʃ])
Lava as mãos antes de comer.
Wash your hands before eating. (mãos [mɐ̃wʃ])
Rough guidelines (not rules):
- Most common pattern: -ão → -ões (corações, lições, razões, traduções, ocasiões). Default assumption.
- Second most common: -ão → -ães (pães, cães, capitães, alemães, catalães). Often for short, old native words and some ethnonyms.
- Rarest: -ão → -ãos (mãos, irmãos, cidadãos, cristãos). Usually for words where the -ão was historically -ano.
There is no reliable shortcut — learn each noun's plural as you learn the noun.
Nasal versus oral vowel — contrastive pairs
Portuguese minimal pairs based on nasality demonstrate why you must produce nasalization accurately. The words are genuinely different; confusing them confuses your listener.
| Oral | IPA | Nasal | IPA | Meanings |
|---|---|---|---|---|
| vi | [vi] | vim | [vĩ] | I saw / I came |
| sou | [so] | são | [sɐ̃w] | I am / they are (or: healthy) |
| lá | [la] | lã | [lɐ̃] | there / wool |
| mau | [maw] | mão | [mɐ̃w] | bad / hand |
| li | [li] | lim (rare) / compare sim | [sĩ] | read (past) / yes |
| cedo | [ˈsedu] | sendo | [ˈsẽdu] | early / being |
Ontem vi a Ana no café, e hoje vim cedo ao trabalho.
Yesterday I saw Ana at the café, and today I came to work early. (vi [vi] vs. vim [vĩ] — the nasality is the whole difference)
Eu sou professora, mas eles são médicos.
I am a teacher, but they are doctors. (sou [so] vs. são [sɐ̃w])
O mau tempo estragou o piquenique, mas demos a mão um ao outro e continuámos.
The bad weather ruined the picnic, but we held hands and carried on. (mau [maw] vs. mão [mɐ̃w])
Production technique — how to make a nasal vowel
Nasalization happens during the vowel, not after. To produce a Portuguese nasal vowel:
- Lower the velum (the soft tissue at the back of the roof of your mouth). This opens the nasal passage.
- Produce the vowel normally — tongue and lips in position for [a], [e], [i], [o], or [u].
- Let air flow through the nose at the same time as through the mouth.
- Don't close your mouth at the end — no m or n closure.
A simple exercise: say English hand. Notice the a already has some nasalization from the following n. Cut off the final -nd and let the nasalized a ring alone — close to [ɐ̃]. Then add = pão.
Repete: pão, mão, não, chão, são.
Repeat: bread, hand, no, floor, they are. (drill of the -ão ending)
Agora: mãe, pães, cães, capitães.
Now: mother, loaves, dogs, captains. (drill of the -ães ending)
E finalmente: bom, põe, limões, razões.
And finally: good, puts, lemons, reasons. (drill of the -õ / -ões endings)
Comparison with French and English
French has four nasal vowels: [ɑ̃] (grand), [ɛ̃] (fin), [ɔ̃] (bon), [œ̃] (un, fading in modern French). French speakers have a head start. Differences:
- Portuguese has five nasal vowels (adding [ẽ] and [ũ]).
- Portuguese nasal diphthongs [ɐ̃w], [ɐ̃j], [õj] are much more extensive — French has nothing equivalent.
- Portuguese nasalization is heavier and longer — the nasal quality is more acoustically prominent.
Em francês, "bon" é curto; em português, "bom" é mais nasal e mais longo.
In French, 'bon' is short; in Portuguese, 'bom' is more nasal and longer.
English has no phonemic nasal vowels. English speakers nasalize slightly before n or m (ran, ham), but this is automatic and non-contrastive — so you must learn Portuguese nasalization from scratch.
Regional variation
Nasalization in European Portuguese is relatively uniform across the standard Lisbon-coastal variety, but there is some variation:
- Lisbon: moderate nasalization; nasal vowels clearly present but not exaggerated.
- Northern Portugal (Porto, Braga): often slightly more closed nasal vowels; some merging tendencies.
- Interior / Alentejo: sometimes heavier or more open nasalization.
- Brazilian Portuguese: similar phonemic inventory but often somewhat lighter nasalization than in Portugal.
The Lisbon standard is the reference. If you are learning European Portuguese, model your nasals on Lisbon speakers.
Common Mistakes
Mistake 1: Over-producing the n or m
English speakers treat m/n in spelling as a separate consonant. In syllable-final position, it isn't — it just nasalizes the vowel.
❌ Saying *campo* as [ˈkampo] with a clear m sound before the p.
Incorrect. The m is silent; only the vowel is nasalized: [ˈkɐ̃pu].
✅ Saying *campo* as [ˈkɐ̃pu], one syllable moving from a nasal [ɐ̃] to [p].
Mistake 2: Under-nasalizing — producing a plain vowel
Without the nasality, vim becomes vi — you've changed words.
❌ Saying *vim* as [vi].
Changes 'I came' to 'I saw'. The vowel must be nasal: [vĩ].
✅ Saying *vim* as [vĩ].
Mistake 3: Treating -ão as a two-syllable sequence
Pão is one syllable. Saying it as two ([pa-o]) or as [pa-n] is both wrong and changes the word.
❌ Saying *pão* as [ˈpa.o].
Two syllables, wrong. It's one syllable: [pɐ̃w].
❌ Saying *pão* as [pan].
No — don't bite down on an n. It's an open nasal diphthong: [pɐ̃w].
✅ Saying *pão* as [pɐ̃w], one syllable.
Mistake 4: Forgetting the nasal i in muito
Muito has an invisible nasalization. Every native speaker produces it; learners often don't.
❌ Saying *muito* as [ˈmujtu].
Foreign-sounding. It should be [ˈmũjtu] with a nasal i.
✅ Saying *muito* as [ˈmũjtu].
Mistake 5: Over-regularizing the -ão plural
Not every -ão becomes -ões in plural. Pão → pães, mão → mãos. Applying the wrong pattern produces a non-word.
❌ Saying *pões* for the plural of *pão*.
Not a word in this sense — *pães* is the correct plural.
✅ dois pães, três cães, quatro capitães.
two loaves, three dogs, four captains.
Mistake 6: Pronouncing bem as [bem] without nasality
Bem is [bɐ̃j] with both nasalization and a glide. An oral [bem] or [bem.] sounds wrong.
❌ Saying *bem* as [bem] with a clear m.
Incorrect. The m is silent; it's a nasal diphthong: [bɐ̃j].
✅ Saying *bem* as [bɐ̃j].
Key Takeaways
- European Portuguese has five nasal vowels ([ɐ̃], [ẽ], [ĩ], [õ], [ũ]) and four nasal diphthongs ([ɐ̃w], [ɐ̃j], [õj], [ũj]).
- Tilde on ã and õ is a direct nasality marker.
- Syllable-final m or n is a nasality marker — it does not pronounce as a separate consonant; it nasalizes the preceding vowel.
- Syllable-initial m or n (with a vowel following) pronounces fully as [m] or [n].
- The word muito has a nasal i ([ˈmũjtu]) despite no tilde or m/n in the syllable. Exception — memorize it.
- Nasal vowels are contrastive: vi/vim, sou/são, lá/lã, mau/mão. Confusing them changes meaning.
- -ão plurals come in three patterns: -ões (most common), -ães, -ãos. Memorize each noun's plural.
- Produce nasal vowels by lowering the velum and letting air flow through the nose during the vowel — without closing your mouth into an m or n.
- French speakers have a head start (similar system, different set of vowels); English speakers must learn the gesture from scratch, as English has no phonemic nasal vowels.
- Regional variation is minor within the standard Lisbon-coastal dialect; northern and interior dialects may nasalize more heavily or slightly differently.
Related Topics
- European Portuguese Pronunciation OverviewA1 — A tour of the sound system of European Portuguese — the vowels, the consonants, the stress patterns, and the features that give the Lisbon standard its unmistakable compressed, consonant-rich character.
- The Portuguese Vowel SystemA1 — A guide to the nine oral vowels of European Portuguese — open and closed mid-vowels, stressed vs. unstressed quality, the reduced vowels that dominate the dialect, and how the spelling encodes it all.
- Vowel Reduction in European PortugueseA1 — The single most distinctive feature of European Portuguese — how unstressed vowels are weakened, centralized, or deleted, producing the compressed, consonant-rich texture of the Lisbon standard.
- Nasal DiphthongsA2 — The four nasal diphthongs of European Portuguese — ão, ãe, õe, and the lone nasal ui of muito — how to recognize them, how to produce them, and how to handle the three plural patterns of -ão nouns.
- Accent Marks: Á, À, Â, Ã, É, Ê, Í, Ó, Ô, Õ, ÚA1 — A field guide to the four diacritics of Portuguese — acute, circumflex, tilde, and grave — and what each one tells you about pronunciation, stress, and vowel quality.
- Minimal Pairs in European PortugueseA2 — Pairs of words distinguished by a single sound — the diagnostic test for what counts as a phoneme in European Portuguese, and the most efficient drill for training your ear and your mouth.