Quaternary - Definition

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