Usually means: Ancient geological eon, early Earth.
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We found 19 dictionaries that define the word archean:

General (17 matching dictionaries)
  1. Archean: Merriam-Webster
  2. Archean, the Archean: Oxford Learner's Dictionaries
  3. Archean: American Heritage Dictionary of the English Language
  4. Archean: Collins English Dictionary
  5. Archean, archean: Vocabulary.com
  6. Archean: Wordnik
  7. Archean: Wiktionary
  8. Archean: Webster's New World College Dictionary, 4th Ed.
  9. Archean (Archaean): The Wordsmyth English Dictionary-Thesaurus
  10. Archean: Infoplease Dictionary
  11. Archean: Dictionary.com
  12. Archean: Wikipedia, the Free Encyclopedia
  13. Archean: Rhymezone
  14. archean: FreeDictionary.org
  15. archean: Mnemonic Dictionary
  16. Archean: TheFreeDictionary.com
  17. Archean: Merriam-Webster

Computing (1 matching dictionary)
  1. Archean: Encyclopedia

Science (1 matching dictionary)
  1. Illustrated Glossary of Geologic Terms (No longer online)

Definitions from Wiktionary (Archean)

adjective:  Alternative form of Archaean [(mythology) Of or relating to Arche, the Muse of beginnings in Greek mythology.]
noun:  Alternative form of Archaean [(geology) The eon from 2,500 Ma to 4,000 Ma.]

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