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eon

noun [C] (UK also aeon)
 
 
/ˈiː.ɒn/ US  /-ɑːn/

Definition

a period of time that is so long that it cannot be measured: informal I've been waiting eons for my new computer.Long periods of time
(Definition of eon noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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