1. A conclusive, final, or authoritative answer that settles a matter completely
The judge's definitive reply ended all speculation about the case.
A resposta definitiva do juiz encerrou toda especulação sobre o caso.
2. An answer that is conclusive and will not be changed or questioned further
We are still waiting for a definitive reply from the government on the new policy.
Ainda estamos aguardando uma resposta definitiva do governo sobre a nova política.