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Definitions of Quaternary:
  • noun:   last 2 million years
  • noun:   the cardinal number that is the sum of three and one
  • adjective:   consisting of or especially arranged in sets of four
    Example: "A quaternary compound"
  • adjective:   coming next after the third and just before the fifth in position or time or degree or magnitude
    Example: "The quaternary period of geologic time extends from the end of the tertiary period to the present"

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