adjective Date: 1944 of, relating to, or being a situation (as a game or relationship) in which a gain for one side entails a corresponding loss for the other side
ZERO-SUM
Meaning of ZERO-SUM in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012