Definition of yesterday noun from the Oxford Advanced Learner's Dictionary

      

    yesterday

     noun
    noun
    BrE BrE//ˈjestədeɪ//
     
    ; NAmE NAmE//ˈjestərd//
     
    ; BrE BrE//ˈjestədi//
     
    ; NAmE NAmE//ˈjestərdi//
     
    [uncountable]
     
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  1. 1  the day before today Yesterday was Sunday. What happened at yesterday's meeting?
  2. 2  (also yesterdays [plural]) the recent past Yesterday's students are today's employees. All her yesterdays had vanished without a trace.
  3. Word Origin Old English giestran dæg (from yester- Old English geostran, of Germanic origin + day).
See the Oxford Advanced American Dictionary entry: yesterday