American English

Definition of eon noun from the Oxford Advanced American Dictionary

     

    eon

     noun
    noun
    NAmE//ˈiən//
     
    , NAmE//ˈiɑn//
     
     
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  1. 1 an extremely long period of time; thousands of years Only yesterday—and it seemed eons ago, not just a few hours—he had been a happily married man.
  2. 2(geology) a major division of time, divided into eras eons of geological history
See the Oxford Advanced Learner's Dictionary entry: eon