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proterozoic aeon
 
Noun proterozoic aeon has 1 sense
  1. Proterozoic, Proterozoic eon, Proterozoic aeon - from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
    --1 is a kind of eon, aeon
    --1 is a part of
     Precambrian, Precambrian eon, Precambrian aeon, Precambrian period
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