1. to behave in a manner that is suitable, proper, or acceptable for a given situation or context
The ambassador was instructed to act appropriately at the formal dinner.
O embaixador foi instruído a agir apropriadamente no jantar formal.
2. to conduct oneself with decorum and respect according to social norms
Students are expected to act appropriately during the school assembly.
Espera-se que os alunos ajam apropriadamente durante a assembleia escolar.