Meaning of “insider” in the English Dictionary

american-english dictionary
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(Definition of “insider” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"insider" in American English

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insidernoun [ C ]

us /ɪnˈsɑɪ·dər, ˈɪnˌsɑɪ-/

someone who is an accepted member of a group:

His books have made him an insider in the music world.

(Definition of “insider” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"insider" in Business English

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insidernoun [ C ]

uk /ɪnˈsaɪdər/ us

WORKPLACE someone who is part of a group, or who works for a company or an organization and therefore has special knowledge or influence:

She has an insider's view of the often brutal nature of trading in the stock market.
an industry insider

WORKPLACE, FINANCE someone who is in a high position in a company, or someone who owns ten or more percent of shares in a company:

a company insider
This form needs to be filled out by any newly appointed corporate insider.

(Definition of “insider” from the Cambridge Business English Dictionary © Cambridge University Press)