Definitions for "zero-sum game"
Keywords:  gain, game, losers, winnings, situation
A situation where the one participants gains are only the result of another...
A purely competitive game, in which one player's winnings are the others' losses, so the net gain is zero across all players.
Situation or interaction in which one participant's gains result only from another's equivalent losses.
a negotiation in which whatever you win, your opponent loses
a situation in which a fixed quantity of goods (or whatever) are redistributed
a situation in which a resource is available to be invested, but is available to be invested only as a whole, and therefore only by a single party