Usually means: Time before abundant complex life.
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We found 8 dictionaries that define the word proterozoic eon:

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

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

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Definitions from WordNet (Proterozoic eon)

▸ noun:  from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms


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