This is the 720th most frequent Portuguese word.
estádio
Stadium.
In this sentence, 'estádio' is used in its literal sense, referring to a sports venue where events such as football matches are held.
O estádio está lotado para o jogo de hoje.
The stadium is full for today's game.
Here, 'estádio' is a homophone for 'estágio' often confused in spoken informal contexts, but the intended word in this usage is 'estágio,' meaning 'stage' or 'phase' of a process.
O projeto está ainda no estágio de planejamento.
The project is still in the planning stage.
In this case, 'estádio' again refers to a large venue typically used for sports but also for other events like concerts.