1. (noun) Quaternary, Quaternary period, Age of Man
last 2 million years
Synonyms: quaternion, quartet, quaternity, tetrad, foursome, four, quadruplet, quatern
Antonyms: cardinal, single
2. (adj) four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
the cardinal number that is the sum of three and one
Synonyms: quartette, quadruple, quaternion, quartet, quaternary, quad, tetrad, four, foursome, quaternity, intravenous feeding, quadruplet, quatern, four-spot
Antonyms: cardinal, single
3. (adj) quaternate, quaternary
consisting of or especially arranged in sets of four
Synonyms: quaternary, fourth, quaternate
Antonyms: cardinal, single
4. (adj) fourth, 4th, quaternary
coming next after the third and just before the fifth in position or time or degree or magnitude
Synonyms: quaternary, fourth, quaternate
Antonyms: cardinal, single
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Synonyms and Antonyms of quaternary 
