insider

noun

USin-SY-dur/ɪnˈsaɪdɚ/UKin-SY-duh/ɪnˈsaɪdə/

2 meanings of insider

1
nouncountable
Someone within a group, organization, or institution who has special knowledge of its inner workings.
Only an insider could have known the company planned to cut those jobs.
Government insiders leaked the details of the proposed budget weeks early.
Similarsource
Oppositeoutsider
2
nouncountable
A person located within an enclosed space.
The firefighters called out to any insider still trapped in the building.
Once the heavy doors sealed shut, the insiders had no way to signal for help.
Similaroccupant
Oppositeoutsider

Practice

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Origin

Formed from "inside" combined with the suffix "-er".