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proterozoic eon is a noun meaning "from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms". It carries one recorded sense.
from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
Definitions, synonyms and semantic relations for proterozoic eon come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.