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Quaternary

Definition

[n] the cardinal number that is the sum of three and one
[n] last 2 million years
[adj] 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"
[adj] consisting of or especially arranged in sets of four; "quaternate leaves"; "a quaternary compound"


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