Usually means: Eon before Cambrian, early life.
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We found 19 dictionaries that define the word proterozoic:

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

Computing (1 matching dictionary)
  1. Proterozoic: Encyclopedia

Science (2 matching dictionaries)
  1. Illustrated Glossary of Geologic Terms (No longer online)
  2. Proterozoic: USGS Paleontology Glossary of Terms

(Note: See proterozoics as well.)

Definitions from Wiktionary (Proterozoic)

adjective:  (geology) Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.
noun:  (geology) The eon from 2,500 Ma to 541.0±1.0 Ma, the beginning of the Phanerozoic, marked by the build up of oxygen in the atmosphere and the emergence of primitive multicellular life.
adjective:  Alternative form of Proterozoic [(geology) Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.]

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