| Quaternary 1. (a.) Consisting of four; by fours, or in sets of four. 2. (a.) Later than, or subsequent to, the Tertiary; Post-tertiary; as, the Quaternary age, or Age of man. 3. (n.) The number four. 4. (n.) The Quaternary age, era, or formation. Thesaurus Entries 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 |