eon

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e·on

also ae·on  (ē′ŏn′, ē′ən)
n.
1. An indefinitely long period of time; an age.
2. The longest division of geologic time, containing two or more eras.

[Late Latin aeōn, from Greek aiōn; see aiw- in Indo-European roots.]

eon

(ˈiːən; ˈiːɒn)
n
the usual US spelling of aeon

e•on

or ae•on

(ˈi ən, ˈi ɒn)

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.
[1640–50; < Late Latin aeōn < Greek aiṓn space of time, age]

e·on

(ē′ŏn′)
The longest division of geologic time, containing two or more eras.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.eon - the longest division of geological time
geologic time, geological time - the time of the physical formation and development of the earth (especially prior to human history)
geological era, era - a major division of geological time; an era is usually divided into two or more periods
2.eon - an immeasurably long period of time; "oh, that happened eons ago"
long time, years, age - a prolonged period of time; "we've known each other for ages"; "I haven't been there for years and years"
3.eon - (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe
Gnosticism - a religious orientation advocating gnosis as the way to release a person's spiritual element; considered heresy by Christian churches
spiritual being, supernatural being - an incorporeal being believed to have powers to affect the course of human events

eon

also aeon
noun
A long time:
eternity, long, year (used in plural).
Informal: age (used in plural), blue moon.