eon

1. The longest division of geological time (synset 115268541)
   is a type of: geologic time, geological time - the time of the physical formation and development of the earth (especially prior to human history)
   specific instances:

   • phanerozoic, phanerozoic aeon, phanerozoic eon - the period from about 540 million years ago until the present, a period when abundant life existed
   • precambrian, precambrian aeon, precambrian eon, precambrian period - the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
   • proterozoic, proterozoic aeon, proterozoic eon - from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
   • archaeozoic, archaeozoic aeon, archean, archean aeon, archean eon, archeozoic, archeozoic eon - the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
   • hadean, hadean aeon, hadean eon, hadean time, priscoan, priscoan aeon, priscoan eon - the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life
   has: era, geological era - a major division of geological time; an era is usually divided into two or more periods
   same as: aeon
2. An immeasurably long period of time (synset 115268401)
   "oh, that happened eons ago"
   is a type of: age, long time, years - a prolonged period of time
   same as: aeon
3. (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe (synset 109559695)
   referred to in: gnosticism - a religious orientation advocating gnosis as the way to release a person's spiritual element; considered heresy by Christian churches
   is a type of: spiritual being, supernatural being - an incorporeal being believed to have powers to affect the course of human events
   same as: aeon

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