symmetry

n. (pl. -ies) 1 a correct proportion of parts. B beauty resulting from this. 2 a structure allowing an object to be divided into parts of an equal shape and size. B possession of such a structure. 3 repetition of exactly similar parts facing each other or a centre.  symmetrical adj. Symmetrically adv. [greek summetria]

n. A due proportion of the several parts of a body to each other; adaptation of the form or dimensions of the several parts of a thing to each other; the union and conformity of the members of a work to the whole.