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Definition of epoch noun from the Oxford Advanced American Dictionary

     

    epoch

     noun
    noun
    NAmE//ˈɛpək//
     
    (formal or literary)
     
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  1. 1a period of time in history, especially one during which important events or changes happen synonym era The death of the emperor marked the end of an epoch in the country's history.
  2. 2(geology) a length of time that is a division of a period geological epochs
See epoch in the Oxford Advanced Learner's Dictionary
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