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

      

    before

     conjunction
    conjunction
    BrE BrE//bɪˈfɔː(r)//
     
    ; NAmE NAmE//bɪˈfɔːr//
     
     
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  1. 1  earlier than the time when Do it before you forget. Did she leave a message before she went? Before I made a decision, I thought carefully about it.
  2. 2  until It may be many years before the situation improves. It was some time before I realized the truth.
  3. 3  used to warn or threaten somebody that something bad could happen Put that away before it gets broken.
  4. 4(formal) rather than I'd die before I apologized!
  5. Word Origin Old English beforan (see by, fore), of Germanic origin; related to German bevor.
See the Oxford Advanced American Dictionary entry: before