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Definitions of quaternary
  1. noun
    last 2 million years
  2. adjective
    coming next after the third and just before the fifth in position or time or degree or magnitude
    "the quaternary period of geologic time extends from the end of the tertiary period to the present"

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  3. adjective
    consisting of or especially arranged in sets of four
    "a quaternary compound"

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  4. noun
    the cardinal number that is the sum of three and one
    type of:
Explanation of quaternary
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