A game, especially baseball, that is played with a ball.
a. A competition: “But in the winner-take-all world of politics, the contest for the undecided 2 or 3 percent can be the whole ballgame”(Brad Edmondson).
b. A particular condition, situation, or set of circumstances.
Anthropology A game with religious and political significance in Mayan and various other pre-Columbian societies of Mesoamerica, southwestern North America, and the Caribbean, played with a rubber ball in a walled court.