Usually means: Ancient geological eon, early Earth.
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We found 8 dictionaries that define the word archean eon:

General (7 matching dictionaries)
  1. Archean eon: Vocabulary.com
  2. archean eon: Dictionary.com
  3. Archean Eon: Wikipedia, the Free Encyclopedia
  4. Archean eon: Rhymezone
  5. archean eon: FreeDictionary.org
  6. archean eon: Mnemonic Dictionary
  7. Archean eon: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Archean Eon: Encyclopedia

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Definitions from WordNet (Archean eon)

▸ noun:  the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life


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