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English definition of “on”

on

preposition (PAYMENT)    /ɒn/ US  /ɑːn/ informal
used to show who is paying for something: This meal is on me. She had her operation done on the National Health Service .Paying and spending money Grammar:On, ontoOn and onto are prepositions.
(Definition of on preposition (PAYMENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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