eon

Definition of Eon in English :

1. aeon, eon

the longest division of geological time

2. aeon, eon

an immeasurably long period of time

Example Sentences:
'oh, that happened eons ago'

3. aeon, eon

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

WordNet Lexical Database for English. Princeton University. 2010.

Eon

noun

the usual US spelling of aeon

noun

1.

an extremely long, indefinite period of time; thousands and thousands of years

2. Geology

a.

the major unit of geologic time, usually subdivided into eras

see the geologic time chart in the Reference Supplement

b.

a billion years

n.

1. An indefinitely long period of time; an age.

2. The longest division of geologic time, containing two or more eras.