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nounlast 2 million years
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part of: -
adjectivecoming next after the third and just before the fifth in position or time or degree or magnitude
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adjectiveconsisting of or especially arranged in sets of four
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nounthe cardinal number that is the sum of three and one
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Examples of quaternary
- "the quaternary period of geologic time extends from the end of the tertiary period to the present"
- "a quaternary compound"