eon

or ae·on

[ ee-uhn, ee-on ]

noun

1. an indefinitely long period of time; age.
2. the largest division of geologic time, comprising two or more eras.
3. Astronomy. one billion years.

eon

/ ˈiːən; ˈiːɒn /

noun

1. the usual US spelling of aeon
2. geology the longest division of geological time, comprising two or more eras

eon

/ ē′ŏn′ /

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

Word History and Origins

Origin of eon¹

aeon

Example Sentences

Bush ran his last competitive race in 1998, an eon ago in political terms.

From The Daily Beast

Each change was supposed to denote the birth of some angel or celestial being known as an Eon.

From Project Gutenberg

Action with a purpose is deliberate; it involves a consciously foreseen end and a mental weighing of considerations pro and eon.

From Project Gutenberg

He descended to the edge of the clearing and picked his way through the debris of some eon-old geologic catastrophe.

From Project Gutenberg

After what seemed an eon it struck the edge of the subway kiosk, bounced like a rag doll and sprawled across the pavement.

From Project Gutenberg

After what seemed an eon of waiting, he ventured another look ahead.

From Project Gutenberg