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What does Proterozoic mean?

Looking for the meaning or definition of the word Proterozoic? Here's what it means.

Proper noun
  1. (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
  1. (geology) Of or relating to the geologic eon from 2,500 Ma to 541.0±1.0 Ma.
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