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Eon
(redirected from ÆON)

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eon

Long span of geologic time. In formal usage, eons are the longest portions of geologic time (eras are the second-longest). Three eons are recognized: the Phanerozoic Eon (dating from the present back to the beginning of the Cambrian Period), the Proterozoic Eon, and the Archean Eon. Less formally, eon often refers to a span of one billion years.

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