Definite Articles: O, A, Os, As | Portuguese (Brazil) Grammar

The English definite article is one invariable word: the. The Brazilian definite article is four words — o, a, os, as — that agree in gender and number with the noun, contract with prepositions, and, crucially, appear in many places where English uses no article at all. Getting the article right is the single most pervasive habit in BR: it touches almost every noun phrase you'll ever build, and over-translating from English ("dropping the the") is one of the most persistent learner errors.

The four forms

The article matches the noun's gender (masculine/feminine) and number (singular/plural).

	Masculine	Feminine
Singular	o	a
Plural	os	as

o menino, a menina, os meninos, as meninas

the boy, the girl, the boys, the girls

O ônibus atrasou e as crianças ficaram na chuva.

The bus was late and the kids stood in the rain. (o + masc. sg., as + fem. pl.)

Obligatory contractions

When de, em, a, or por precede the article, they must fuse into one word. This is not stylistic — the uncontracted forms are simply ungrammatical.

	o	a	os	as
de	do	da	dos	das
em	no	na	nos	nas
a	ao	à	aos	às
por	pelo	pela	pelos	pelas

Note the crase accent: a + a = à (the two identical vowels merge and take a grave accent). It looks like a typo to English eyes but is obligatory.

Cheguei à praia ao meio-dia e voltei pelo caminho do rio.

I got to the beach at noon and came back along the river path. (a+a=à, a+o=ao, por+o=pelo, de+o=do)

A chave está na gaveta da cozinha, não no quarto.

The key is in the kitchen drawer, not in the bedroom. (em+a=na, de+a=da, em+o=no)

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If your sentence contains "of the / in the / to the / by the", it will contract in BR. Train your ear so de o or em a sounds physically wrong — because to a native speaker it is.

Where English drops "the" but BR keeps it

This is the heart of the page. BR uses the definite article far more than English. Whenever you'd say a generic or abstract noun in English with no article, BR usually wants one.

Abstract and generic nouns

To talk about a concept in general, English uses a bare noun ("Patience is a virtue", "Life is beautiful", "I love music"). BR puts the article on it.

A paciência é uma virtude.

Patience is a virtue. (English: no article; BR: a paciência)

A vida é bela.

Life is beautiful.

Eu adoro música, principalmente o samba.

I love music, especially samba. (the genre takes o)

The logic: BR treats the abstraction as a definite, whole concept — "patience-as-such", the entirety of it — and the definite article marks that totality. English treats the same abstraction as an uncountable mass and leaves it bare.

The contrast that proves the point

The clearest demonstration is the difference between a generic mention and a specific one — note that English drops the article in both cases for some nouns, but BR distinguishes them:

Gosto de café.

I like coffee. (coffee in general — after gostar de, the article is often omitted)

O café tá quente.

The coffee is hot. (this specific cup — article required)

So the article is not automatic everywhere; after gostar de and similar, generic mass nouns often go bare. But for a specific, identifiable instance, the article returns.

Countries, regions, oceans

Most countries take the article (o Brasil, os Estados Unidos, a França, a Itália), and so do regions, rivers, and oceans (o Amazonas, o Atlântico). A handful of countries and most cities don't (Portugal, São Paulo — covered in the names page).

O Brasil é maior do que a Argentina e o Chile juntos.

Brazil is bigger than Argentina and Chile combined. (o Brasil, a Argentina, o Chile)

Body parts and personal possessions

Where English uses a possessive ("I washed my hands", "I brushed my teeth"), BR uses the definite article plus a reflexive or just the bare article — the ownership is obvious from context, so a possessive would be redundant.

Lavei as mãos antes de comer.

I washed my hands before eating. (not 'minhas mãos' — the article suffices)

Escovei os dentes e penteei o cabelo.

I brushed my teeth and combed my hair. (os dentes, o cabelo — article, not possessive)

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For your own body parts, use the definite article, not a possessive: Quebrei o braço ("I broke my arm"), not Quebrei meu braço. Using the possessive isn't wrong, but it sounds translated; the article is the native default.

Days of the week and times

A reunião é na segunda, e o resultado sai na sexta.

The meeting is on Monday, and the result comes out on Friday. (na segunda = em + a segunda(-feira))

Colloquially, before first names

In most of Brazil — especially the Southeast and South — people put the article before a first name in casual speech: a Maria, o João. This is informal and regional (less common in the Northeast, absent in formal writing). It gets its own page.

A Ana ligou pra você, e o Pedro vai chegar mais tarde.

Ana called you, and Pedro will arrive later. (informal/regional article before names)

When BR also drops the article

Fairness requires noting BR isn't article-happy everywhere. It omits the article in some fixed contexts: after certain prepositions in set phrases (em casa "at home", de manhã "in the morning"), with most cities (Moro em Salvador), and after gostar de with generic mass nouns as seen above. These are learned case by case, but the dominant tendency is still: when in doubt and the noun is generic or abstract, BR uses the article and English doesn't.

Vou pra casa de manhã.

I'm going home in the morning. (em casa, de manhã — fixed phrases, no article)

Common Mistakes

❌ Vida é bela.

Incorrect — generic abstract noun needs the article in BR.

✅ A vida é bela.

Life is beautiful.

❌ Eu moro em o Brasil.

Incorrect — em + o must contract, and Brasil takes the article.

✅ Eu moro no Brasil.

I live in Brazil. (em + o = no)

❌ Lavei minhas mãos.

Understandable but translated — BR uses the article for body parts.

✅ Lavei as mãos.

I washed my hands.

❌ Fui a a praia no domingo.

Incorrect — a + a must contract to à (crase).

✅ Fui à praia no domingo.

I went to the beach on Sunday.

❌ Paciência é uma virtude e respeito é fundamental.

Incorrect — both abstract nouns need articles.

✅ A paciência é uma virtude e o respeito é fundamental.

Patience is a virtue and respect is fundamental.

Key Takeaways

Four agreeing forms: o, a, os, as.
Prepositions de, em, a, por
- article always contract (do, na, ao, pelo), with crase à.
BR uses the article far more than English: abstract/generic nouns (a vida, a paciência), countries (o Brasil), body parts (as mãos), and informally before first names (a Ana).
Exceptions exist (em casa, de manhã, cities like São Paulo, generic nouns after gostar de), but the default for English speakers to fight is under-using the article.

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