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QUATERNARY

Definition:

1. [noun] last 2 million years
   Synonyms: Quaternary, Quaternary period, Age of Man
   
   
2. [noun] the cardinal number that is the sum of three and one
   Synonyms: four, IV, tetrad, quatern, quaternion, quaternity, quartet, quadruplet, foursome, Little Joe
   
   
3. [adjective] consisting of or especially arranged in sets of four; "quaternate leaves"; "a quaternary compound"
   Synonyms: quaternate
   
   
4. [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"
   Synonyms: fourth, 4th
   
   

Synonyms:

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