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English definition of “insider”

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insider

noun [C] uk   /ɪnˈsaɪ.dər/ us    /-dɚ/
someone who is an accepted member of a group and who therefore has special or secret knowledge or influence: According to insiders, the committee is having difficulty making up its mind.
(Definition of insider from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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