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English definition of “zero-sum”

zero-sum

adjective [before noun]     /ˌzɪə.rəʊˈsʌm/ US  /ˌzɪr.oʊ-/
describes a situation in which any win by one person always means a loss to another person involved : The stock market is now a zero-sum game , in which one party gains what the other loses .Expressions used to describe situations
(Definition of zero-sum adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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