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English definition of “upon”

upon

preposition uk   /əˈpɒn/ us    /-ˈpɑːn/
B2 formal on: Upon her head she wore a black velvet hat. You can never place enough emphasis upon the importance of safety. Upon your arrival (= as soon as you arrive), please report to the reception desk.On or off be upon sb formal to be something that someone will experience or have to deal with soon: Another couple of weeks and the holidays will be upon us.About to happenCloseness in distance and time
(Definition of upon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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