eon

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noun \ˈē-ən, ˈē-ˌän\
variants: or chiefly British

Definition of eon

  1. 1 :  an immeasurably or indefinitely long period of time :  age <I haven't seen him in eons.>

  2. 2a :  a very large division of geologic time usually longer than an era <the Archean eon>b :  a unit of geologic time equal to one billion years

Origin and Etymology of eon

Latin, from Greek aiōn — more at 3aye


First Known Use: circa 1642


EON Defined for Kids

eon

Definition of eon for Students

  1. variant of aeon



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