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

aeon

noun
 
/ˈiːən/,
 
/ˈiːɒn/
 
/ˈiːən/,
 
/ˈiːɑːn/
(British English)
(North American English or specialist eon)
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  1. (formal) an extremely long period of time; thousands of years
    • Only yesterday—and it seemed aeons ago, not just a few hours—he had been a happily married man.
    Topics Timec2
  2. (geology) a major division of time, divided into eras
    • aeons of geological history
    • These hills have been worn down over aeons of geological time.
  3. Word Originmid 17th cent.: via ecclesiastical Latin from Greek aiōn ‘age’.

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