[cos.mol.o.gy] n, pl -gies [NL cosmologia, fr. Gk kosmos + NL -logia -logy] (ca. 1656) 1 a: a branch of metaphysics that deals with the nature of the universe b: a theory or doctrine describing the natural order of the universe
2: a branch of astronomy that deals with the origin, structure, and space-time relationships of the universe; also: a theory dealing with these matters -- cos.mo.log.i.cal adj -- cos.mo.log.i.cal.ly adv -- cos.mol.o.gist n