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English definition of “zero-sum”

zero-sum

adjective [before noun] uk   /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.
(Definition of zero-sum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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