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insider

noun

  1. someone on the inside
L322586 on Wikidata ↗

Wiktionary

Pronunciation: /ɪnˈsaɪdɚ/ / /ˈɪnsaɪdɚ/

noun

Etymology: Etymology tree Middle English ynneside English inside Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English insider From inside + -er.

  1. A person who has special knowledge about the inner workings of a group, organization, or institution.

    Near-synonyms: initiate, old hand, habitué

    Heavy losses were sustained in Simms Petroleum, which took a greater toll from supposed "Wall Street insiders" than from the general public.

  2. A person who is within an enclosed space.

    To the insider, the ceiling is like a small firmament twinkling with astral radiations.