Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “on”


adverb (POSITION)    /ɒn/ US  /ɑːn/
used when talking about the position of one thing compared with the position of another: It's amazing nobody was injured because the two buses collided head on (= the front parts of the buses hit each other).UK The bike hit our car side on (= hit the side of the car rather than the front or back).UK It would be easier to get the bookcase through the doorway if we turned it sideways on (= turned it so that one of its sides is at the front).On or off Grammar:On, ontoOn and onto are prepositions.See more
(Definition of on adverb (POSITION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of on

Definitions of “on” in other dictionaries

Word of the Day


an ability to do things in the stated, especially positive, way

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