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English definition of “on”

on

preposition (AFTER)    /ɒn/ US  /ɑːn/
happening after and usually because of: Acting on information given to them anonymously , the police arrested him. He inherited a quarter of a million pounds on his mother's death . On their return they discovered that their house had been burgled .Describing when something happened or will happen Grammar:On, ontoOn and onto are prepositions.
(Definition of on preposition (AFTER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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