Definition of ancient history noun from the Oxford Advanced American Dictionary

     

    ancient history

     noun
    noun
     
    [uncountable]
     
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  1. 1the history of societies that existed thousands of years ago, especially in Rome, Greece, and Egypt
  2. 2(informal) if something is ancient history, it happened or existed a long time ago and is no longer important Don't worry, our disagreements are ancient history.