Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “insider”

insider

noun [C]     /ɪnˈsaɪdər/
someone who knows about a business or organization because they are part of it: Industry insiders say they are surprised by the company's success. → Compare outsiderEmployees and colleagues
(Definition of insider noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “insider” in other dictionaries

Word of the Day

handout

a document given to students or reporters which contains information about a particular subject

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More