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Meaning of eon

e•on

Pronunciation: (ē'un, ē'on), [key]
— n.
  1. an indefinitely long period of time; age.
  2. the largest division of geologic time, comprising two or more eras.
  3. one billion years.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
  • eon (Thesaurus)