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English definition of “on”

on

adverb (HAPPENING)    /ɒn/ US  /ɑːn/
B2 happening or planned : I'm busy tomorrow , but I've got nothing on the day after. I've got a lot on at the moment . Is the party still on for tomorrow ? Food had to be rationed when the war was on. Are there any good films on (= being shown ) at the cinema this week ?Occurring and happening Grammar:On, ontoOn and onto are prepositions.
(Definition of on adverb (HAPPENING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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