Gender Rules and Patterns

Portuguese gender looks random at first, but the language is actually quite systematic. Once you learn a handful of ending patterns, you can predict the gender of most nouns you meet — even words you've never seen before. This page lists the patterns worth memorising, grouped by gender, with a reliability score for each one so you know which rules to trust blindly and which ones need caution.

Before diving in, make sure you understand the core concept on the gender basics page. Exceptions that break these rules live on the gender exceptions page.

How to read the reliability scores

A rule is marked 100% when essentially no common exceptions exist — you can apply it to a new word with full confidence. ~95% means a handful of exceptions you should know about but the default holds. ~85% means usually right but keep your eyes open. ~70% is a tendency rather than a rule.

Masculine endings

-o (~92%)

Nouns ending in -o are masculine in the overwhelming majority of cases. This includes almost every noun derived from a verb (e.g., o trabalho from trabalhar), loanwords ending in -o, and derived nouns with -inho/-zinho.

The main exceptions to know are a mão (hand), a foto (photo, short for fotografia), a moto (motorbike, short for motocicleta), a tribo (tribe), and a libido. See the exceptions page for the full list.

-or (~90%)

Most agent nouns and many abstract nouns ending in -or are masculine: o ator, o doutor, o professor, o autor, o amor, o calor, o sabor.

Notable exceptions: a cor (colour), a dor (pain), a flor (flower). A mnemonic: "cor, dor, flor — three short feminines in -or."

-ão (~70%)

The ending -ão is a real headache because it covers nouns of both genders. Most are masculine — o pão, o coração, o cão, o irmão, o limão, o verão, o chão — but a large and important group is feminine, specifically the -ção, -são, and a few isolated words like a mão.

Because -ão splits, treat it as a tendency, not a rule. If the word ends in -ção or -são, it's feminine (see below). Otherwise, it's probably masculine — but verify when you can. The -ão plurals page covers the three different plural branches that follow from this gender mess.

-ema, -oma, -ima (Greek origin, ~98%)

Nouns ending in -ema, -oma, or -ima that come from Greek neuter -ma words are masculine in Portuguese, despite the final -a. This is one of the cleaner "hidden" rules once you know it.

Common examples: o problema, o sistema, o tema, o poema, o programa, o cinema, o drama, o clima, o aroma, o dilema, o teorema. If you can trace a noun ending in -ma back to Greek (many are scientific or classical), it is almost certainly masculine.

-l (~85%)

Most nouns ending in -l are masculine: o papel, o animal, o anel, o hotel, o sal, o sol, o hospital, o jornal, o túnel.

Watch for feminine exceptions like a catedral, a capital (in the city sense — see the gender-meaning-change page), a moral (in the morality sense), a vogal (vowel), a espiral (spiral), and a cal (building lime). Most -l nouns you'll meet in daily speech are masculine, so the exception list is shorter than you might fear.

Months, directions, languages, numbers (100%)

These four semantic categories are reliably masculine:

• Months: o janeiro, o fevereiro, o março... — janeiro é frio em Portugal. (Under the Acordo Ortográfico de 1990, month names are now written in lowercase in PT-PT, though you'll still see capitalised forms in older texts.)
• Cardinal directions: o norte, o sul, o este, o oeste.
• Languages: o português, o inglês, o francês, o japonês, o chinês.
• Numbers used as nouns: o três, o sete, o zero.

Feminine endings

-ção (100%)

Every Portuguese noun ending in -ção is feminine. No exceptions worth mentioning. This is the single most reliable gender rule in the language — if you see -ção, the article is a, period.

Examples abound: a canção, a nação, a criação, a emoção, a informação, a situação, a tradução, a lição, a refeição, a eleição. These are the Portuguese cognates of English -tion words, which makes them easy to recognize and learn in bulk.

-são (100%)

Nouns ending in -são are also reliably feminine. Most correspond to English -sion words: a visão, a decisão, a paixão, a missão, a expressão, a conclusão, a dimensão, a pressão.

-dade (100%)

Every noun ending in -dade is feminine, without exception. These correspond mostly to English -ity words: a cidade, a verdade, a liberdade, a qualidade, a universidade, a realidade, a felicidade, a identidade, a comunidade, a possibilidade.

Together, -ção, -são, and -dade give you three 100%-reliable feminine rules covering a huge portion of abstract vocabulary.

-agem (~95%)

Nouns ending in -agem are almost always feminine: a viagem, a paisagem, a linguagem, a imagem, a passagem, a mensagem, a massagem, a vantagem, a garagem, a coragem.

A couple of words vary or are epicene (o personagem / a personagem, where both are used in different registers — see the exceptions page), but for everyday learning, treat -agem as feminine.

-ice (100%)

The suffix -ice, which forms abstract nouns from adjectives (often with a slightly pejorative or playful flavour), is always feminine: a velhice (old age), a meninice (childishness), a doidice (craziness), a tolice (silliness).

-tude (100%)

The suffix -tude, from Latin -tudo, gives abstract feminine nouns: a atitude, a juventude, a altitude, a longitude, a latitude, a solicitude, a amplitude, a quietude, a inquietude, a solitude, a plenitude.

-ez and -eza (100%)

The suffixes -ez and -eza form abstract feminine nouns, usually from adjectives. -ez gives words like a rapidez (speed), a timidez (shyness), a nudez (nudity), a honradez (honesty), a estupidez (stupidity). -eza gives words like a beleza (beauty), a tristeza (sadness), a certeza (certainty), a natureza (nature), a nobreza (nobility), a fraqueza (weakness).

-a (~85%)

Finally, the big default: nouns ending in -a are feminine most of the time, but with more exceptions than the -o pattern. Classic examples: a casa, a mesa, a água, a cerveja, a janela, a família, a praia, a amiga, a pergunta, a resposta.

The important masculine exceptions are the Greek -ma group (o problema, o sistema, o tema) and a small closed list (o dia, o mapa, o planeta). See the exceptions page for the full inventory.

Summary table

Strategy: use the reliable rules first

When you meet a new Portuguese noun, check it against this mental checklist in order of reliability:

1. 100% rules first. Does it end in -ção, -são, -dade, -ice, -tude, -ez, or -eza? Feminine. Done.
2. Semantic categories. Is it a month, language, direction, or number? Masculine.
3. Strong patterns. Ends in -agem, -ema, -oma, -ima, or -or? Apply the default.
4. Defaults. Ends in -o or -a? Apply the usual, but stay alert for the classic exceptions.
5. Consonants other than -l. Consult a dictionary — these are unpredictable.

Common Mistakes

Once you've drilled these patterns, work through the gender exceptions page, which covers the words that defy the rules above and need to be memorized as a closed list.