Meio vs. Meia in Portuguese: Half an Hour or “A Little” Tired?
Meio agrees with a noun when it means half, but stays unchanged before an adjective when it means somewhat.
Real Life Portuguese · 5 min read · Updated October 15, 2026
The short answer
When meio means half and functions with a noun, it agrees with that noun: meio-dia (noon), meia hora (half an hour), meio litro (half a liter).
Use meio or meia for half of a noun
The agreement is useful for times and quantities. Meio-dia is noon and meia-noite is midnight.
A viagem dura meia hora.
The trip takes half an hour.
Vamos nos encontrar ao meio-dia.
Let’s meet at noon.
Keep meio unchanged when it means somewhat
Before an adjective, meio often means somewhat or a little and works as an adverb. It stays meio for any gender or number: ela está meio cansada; elas estão meio cansadas.
Here meio describes degree, not a fraction of a feminine noun. That is why it does not change to meia even when the person described is feminine.
Estou meio confuso com as instruções.
I’m a little confused by the instructions.
As crianças ficaram meio animadas.
The children got somewhat excited.
Check whether you mean a fraction or a degree
Compare meia hora, where meia modifies the feminine noun hora, with meio atrasada, where meio means somewhat. The word that follows helps identify the grammar.
Meio can also be a noun meaning middle or a way/method, as in no meio da rua and meios de transporte. Learn the full phrase instead of one English translation.
A loja fica no meio da avenida.
The shop is in the middle of the avenue.
Ela chegou meia hora antes e ficou meio preocupada.
She arrived half an hour early and felt a little worried.
Put it into practice
Use meia before a feminine noun when you mean half; use invariant meio before an adjective when you mean somewhat.
Quick practice
Which Portuguese example matches “Let’s meet at noon”?
Choose an answer to check yourself.
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