Definition of once conjunction from the Oxford Advanced Learner's Dictionary



BrE BrE//wʌns//
; NAmE NAmE//wʌns//
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 as soon as; when We didn't know how we would cope once the money had gone. The water is fine once you're in! Word OriginMiddle English ones, genitive of one. The spelling change in the 16th cent. was in order to retain the unvoiced sound of the final consonant.
See the Oxford Advanced American Dictionary entry: once