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English definition of “self-interest”

self-interest

noun [U] uk   /ˌselfˈɪn.tər.est/ us    /-t̬ɚ-/
the act of considering the advantage to yourself when making decisions, and deciding to do what is best for you: The company's donation was surely motivated by self-interest, as it attracted a lot of media attention.
self-interested
adjective uk   /ˌselfˈɪn.tər.es.tɪd/ us    /-t̬ɚ-/
self-interested arguing
(Definition of self-interest from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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