The term 'Meridian Opening' is a crossword solution that can be completed with the word 'ante, ' which is a four-letter word. Ante is a Latin word meaning 'BEFORE' and is used in many contexts, including poker, where it refers to the amount of money that must be put up by each player BEFORE the game begins. In other contexts, ante can refer to a stake or risk taken BEFORE an action is taken. In this case, 'Meridian Opening' could refer to a situation in which a risk must be taken BEFORE a certain event or action can occur.