Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “on”


preposition (MEMBER)    /ɒn/ US  /ɑːn/
C1 used to show when someone is a member of a group or organization: Have you ever served on a jury? There are no women on the committee. How many people are on your staff? She's a researcher on a women's magazine.Supporters, members and defendersBelievers and non-believersNamed organizations and societies and their members Grammar:On, ontoOn and onto are prepositions.See more
(Definition of on preposition (MEMBER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of on

Browse related topics

You are looking at an entry to do with Supporters, members & defenders, but you might be interested in these topics from the Expressing agreement & support topic area:

Definitions of “on” in other dictionaries

Word of the Day


willing to give money, help, kindness, etc., especially more than is usual or expected

Word of the Day


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