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English definition of “on”

on

preposition (PROCESS)    /ɒn/ US  /ɑːn/
used to show that a condition or process is being experienced : He accidentally set his bed on fire . Their flights to Paris are on special offer at the moment . Martin's on holiday this week . I'll be away on a training course next week . I often feel carsick when I'm on a long journey . Crime is on the increase (= is increasing ) again. Grammar:On, ontoOn and onto are prepositions.
(Definition of on preposition (PROCESS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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