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Definitions of eon:

noun:   (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe
noun:   an immeasurably long period of time
noun:   the longest division of geological time
name:  A surname (very rare: popularity rank in the U.S.: #57409)

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Alternative Terms
eternity long blue-moon time-similar-words geochronologic-scale era phanerozoic-eon proterozoic-eon archean-eon gnosticism aeon-4 eon geologist geologic-timescale-table phanerozoic animal-def-leppard-song fossil period-geology cenozoic quaternary holocene precambrian hadean-time archaean proterozoic koine-greek international-commission-on-stratigraphy jbl-eon edaran-otomobil-nasional-berhad mesozoic