The term 'room opening' can be summarized by the crossword solution 'ante, ' which is a four-letter word. Ante is a Latin word meaning 'BEFORE, ' and it is often used in the context of a game or competition to refer to the amount of money that each player must put into the pot BEFORE the game begins. In this context, room opening could refer to the process of entering a room and putting money into the pot BEFORE the game begins.