eon

Pronunciation: /ˈi.ɑn/

The English word “eon” has 6 meanings listed here.

noun

Eternity, the duration of the universe.
An immeasurably or indefinitely long period of time.
A long period of time.
A period of one billion (short scale, i.e. 1,000,000,000) years; a gigayear.
The longest geochronologic unit, being a period of hundreds of millions of years; subdivided into eras.
A spirit being emanating from the Godhead.

From Latin aeon, from Ancient Greek αἰών (aiṓn, “age, era”).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.