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English definition of “once”

once

conjunction     /wʌns/
B2 as soon as, or from the moment when: Once I've found somewhere to live I'll send you my address . Remember that you won't be able to cancel the contract once you've signed .Simultaneous and consecutiveOrder and sequence at once B1 immediately : I knew at once that I'd like it here.Immediately Grammar:OnceOnce is an adverb or conjunction.Grammar:Once as an adverbWe use once as an adverb to mean ‘one single time’:Grammar:Once as a conjunctionWe use once as a conjunction meaning ‘as soon as’ or ‘after’:
(Definition of once conjunction from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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