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

     

    eon

     noun
    (especially North American English)(usually British English aeon)noun
    BrE BrE//ˈiːən//
     
    ; NAmE NAmE//ˈiːən//
     
     
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  1. 1(formal) 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 American Dictionary entry: eon

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