# in on

> English word · Preposition

## Definitions
1. Being or made privy to, a participant in, involved in, included in, or informed of (usually something private or secret, especially a plan or plot).

## Etymology
Extracted from let in on.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/in-on