We found 13 dictionaries that define the word let in on:

General (8 matching dictionaries)

1. let in on: Longman Dictionary of Contemporary English
2. let (someone) in on (something), let in on: Merriam-Webster
3. let in on: Collins English Dictionary
4. let in on: Wiktionary
5. let (someone) in on, let in on: Dictionary.com
6. let (someone) in on, let in on: TheFreeDictionary.com

Business (2 matching dictionaries)

7. let in on: Legal dictionary
8. let in on: Financial dictionary

Computing (1 matching dictionary)

9. let in on: Encyclopedia

Medicine (1 matching dictionary)

10. let in on: Medical dictionary

Miscellaneous (1 matching dictionary)

11. let in on: Idioms

Definitions from Wiktionary (let in on) ▸ verb:  (ditransitive) To disclose information to someone; to tell somebody a secret or share privileged information. Similar: let in, tell, confide, key in, make known, let know, tip off, confide in, open up, confess, more... Opposite: exclude, keep out, shut out, ostracize Phrases: let someone in on something, let in on a secret, more... ▸ Words similar to let in on ▸ Usage examples for let in on ▸ Idioms related to let in on ▸ Wikipedia articles (New!) ▸ Words that often appear near let in on ▸ Rhymes of let in on ▸ Invented words related to let in on