adj. (also geometrical) 1 of, according to, or like geometry. 2 (of a design, architectural feature, etc.) characterized by or decorated with regular lines and shapes. geometric mean the central number in a geometric progression, also calculable as the nth root of a product of n numbers (as 9 from 3 and 27). geometric progression a progression of numbers with a constant ratio between each number and the one before (as 1, 3, 9, 27, 81). geometric tracery tracery with openings of geometric form. geometrically adv.
[ F géometrique f. L geometricus f. Gk geometrikos (as GEOMETER) ]