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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.)

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

eon

[′ē‚än]
(mechanics)
A unit of time, equal to 109 years.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.