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English definition of “on”

on

preposition (NECESSARY)    /ɒn/ US  /ɑːn/
used to show a person or thing that is necessary for something to happen or that is the origin of something: We're relying on you. I might come - it depends on Andrew. Most children remain dependent on their parents while at university . His latest movie is based on a fairy story .Essential or necessary Grammar:On, ontoOn and onto are prepositions.
(Definition of on preposition (NECESSARY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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