eon

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Other spellings[change]

Pronunciation[change]

Noun[change]

Singular
eon

Plural
eons

  1. (countable) An eon is a period of 1,000,000,000 (one billion) years.
  2. (US) (informal) An eon is a very long period of time.
    It feels like it's been an eon since we last saw each other.