Definition of before adverb from the Oxford Advanced Learner's Dictionary



BrE BrE//bɪˈfɔː(r)//
; NAmE NAmE//bɪˈfɔːr//
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 at an earlier time; in the past; already You should have told me so before. It had been fine the week before (= the previous week). That had happened long before (= a long time earlier). I think we've met before. Word OriginOld English beforan (see by, fore), of Germanic origin; related to German bevor.
See the Oxford Advanced American Dictionary entry: before