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Noun quaternary period has 1 sense
  1. Quaternary, Quaternary period, Age of Man - last 2 million years
    --1 is a kind of period, geological period
    --1 is a part of Cenozoic, Cenozoic era, Age of Mammals
    --1 has parts:
     Holocene, Holocene epoch, Recent epoch; Pleistocene, Pleistocene epoch, Glacial epoch
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