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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Quaternary \Qua*ter"na*ry\, adjective [L. quaternarius consisting of four each, containing four, fr. quaterni four each, fr. quattuor four: cf. F. quaternaire. See {Four}.]
1. Consisting of four; by fours, or in sets of four.
2. (Geol.) Later than, or subsequent to, the Tertiary; Post-tertiary; as, the Quaternary age, or Age of man.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Quaternary \Qua*ter"na*ry\, noun [L. numerus quaternarius: cf. F. quaternaire.]
1. The number four. --Boyle.
2. (Geol.) The Quaternary age, era, or formation. See the Chart of {Geology}.
From WordNet (r) 2.0 [wn]:
quaternary
adjective
1: consisting of or especially arranged in sets of four; "quaternate leaves"; "a quaternary compound" [syn: {quaternate}]
2: 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" [syn: {fourth}, {4th}]
noun
1: last 2 million years [syn: {Quaternary period}, {Age of Man}]
2: the cardinal number that is the sum of three and one [syn: {four}, {4}, {IV}, {tetrad}, {quatern}, {quaternion}, {quaternity}, {quartet}, {quadruplet}, {foursome}, {Little Joe}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
41 Moby Thesaurus words for "quaternary": Little Joe, biquadrate, biquadratic, four, four-legged, four-part diaphony, four-rayed, foursome, foursquare, quad, quadrangle, quadrature, quadrennium, quadric, quadrilateral, quadrille, quadrinomial, quadrivalent, quadruped, quadruplet, quartet, quartic, quartile, quatern, quaternion, quaternity, quatrefoil, rectangle, square, square dance, squaring, tetractinal, tetrad, tetragon, tetragram, tetragrammaton, tetrahedron, tetralogy, tetraphony, tetrapody, tetravalent
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