Usually means: Middle era of Precambrian time.
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We found 7 dictionaries that define the word proterozoic aeon:

General (6 matching dictionaries)
  1. Proterozoic aeon: Vocabulary.com
  2. proterozoic aeon: Dictionary.com
  3. Proterozoic aeon: Rhymezone
  4. proterozoic aeon: FreeDictionary.org
  5. proterozoic aeon: Mnemonic Dictionary
  6. Proterozoic aeon: TheFreeDictionary.com

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

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Definitions from WordNet (Proterozoic aeon)

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


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