eon — English Dictionary

Noun

1. Eternity, the duration of the universe.

2. An immeasurably or indefinitely long period of time.

3. A long period of time.

   Usage

   • US usage
   • excessive
   • Informal

   Examples

   It’s been eons since we last saw each other.

   Traditionally, a luncheon is a lunch that takes an eon.

4. A period of one billion (short scale, i.e. 1,000,000,000) years; a gigayear.

   Examples

   More examples (1)

   We live our lives in three dimensions for our threescore and ten allotted years. Yet every branch of contemporary science, from statistics to cosmology, alludes to processes that operate on scales outside of human experience: the millisecond and the nanometer, the eon and the light-year.

5. The longest geochronologic unit, being a period of hundreds of millions of years; subdivided into eras.

6. A spirit being emanating from the Godhead.

Noun

1. the longest division of geological time

   Synonyms

   aeon

   Broader terms

   geological timegeologic time

2. an immeasurably long period of time

   Synonyms

   aeon

   Broader terms

   long timeageyears

   Examples

   oh, that happened eons ago

3. (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe

   Synonyms

   aeon

   Broader terms

   spiritual beingsupernatural being