Endgame/ˈendɡeɪm/ Definition 1 of 3Pro Tip 1/3Broad Application Endgame can be used to describe the final phase of various events, not just games or sports. The project's endgame involved rigorous testing. Pro Tip 2/3Critical Decisions In the endgame, every choice can be crucial to a successful outcome. We're in the endgame now, so think carefully. Pro Tip 3/3Implies Closure The term often implies that the situation is nearing conclusion. The negotiations entered the endgame.