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English definition of “on”

on

preposition (INVOLVEMENT)    /ɒn/ US  /ɑːn/
used to show when someone is involved or taking part in something: I'm working on a new book . In the last lesson we were on the causes of the First World War , weren't we? "Where had we got up to?" "We were on page 42."Taking part and getting involvedGetting involved for one's own benefit or against others' will Grammar:On, ontoOn and onto are prepositions.
(Definition of on preposition (INVOLVEMENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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