1. A decision or ruling that allows something to be opened, initiated, or made accessible; often used in legal, business, or formal contexts to denote permission or authorization to commence operations or proceedings
The court issued an opening decision to allow the case to proceed to trial.
O tribunal proferiu uma decisão de abertura para permitir que o caso prosseguisse para julgamento.
2. In chess, the opening move or strategy decision made at the start of a game
His opening decision in the chess match was to play the Sicilian Defense.
Sua decisão de abertura na partida de xadrez foi jogar a Defesa Siciliana.