Eon

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aeon

(esp US), eon
1. a period of one thousand million years
2. Gnosticism one of the powers emanating from the supreme being and culminating in the demiurge

Eon

 

an interval of time in the earth’s geological history, during which an eonothem formed. It includes several eras. The length of the last eon, the Phanerozoic, is estimated at 570 million years according to isotopic findings. (See alsoGEOCHRONOLOGY.)

eon

[′ē‚än]
(mechanics)
A unit of time, equal to 109 years.