Definition of yesterday noun from the Oxford Advanced American Dictionary

     

    yesterday

     noun
    noun
    NAmE//ˈyɛstərˌdeɪ//
     
    , NAmE//ˈyɛstərdi//
     
    [uncountable]
     
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  1. 1the 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. This is already yesterday's news (= no longer of interest).
See the Oxford Advanced Learner's Dictionary entry: yesterday