eon

/IY1 AH0 N/
noun
  1. 1

    Eternity.

  2. 2

    A period of 1,000,000,000 years.

  3. 3

    The longest time period used in geology.

  4. 4

    A long period of time.

    โ€œIt's been eons since we last saw each other.โ€

  5. 5

    (usually spelled aeon or รฆon) A spirit being emanating from the Godhead.

Source: https://en.wiktionary.org/wiki/eon