Definitions:

1. A game in which the total of all the gains and losses is zero. NOUN
   • The lottery is a classic example of a zero-sum game, where winning big means someone else loses their money.
2. A mathematical concept in game theory where the total gain of all participating entities equals zero, implying that any gain by one participant results in corresponding losses by others. NOUN
   • The economic system is often viewed as a zero-sum game, where the rich get richer while the poor get poorer.
3. One participant's gain is exactly equal to another participant's loss. NOUN
   • In a zero-sum game, any advantage gained by one side directly harms the other.

Synonyms:

• win-lose game