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The Collaborative International Dictionary of English v.0.48 (gcide)

cosmology \cos*mol"o*gy\ (k[o^]z*m[o^]l"[-o]*j[y^]), n. [Gr.
ko`smos the world -logy: cf. F. cosmologie.]
1. The branch of science or philosophy dealing with the
origin and nature of the universe as a whole. specifically
(a) (Philosophy) the branch of metaphysics speculating on
the structure and nature of the most fundamental parts
of the system of creation, such as space and time, the
elements of bodies, the structure of the universe, the
modifications of material things, causality, the laws
of motion, and the order and course of nature.
(b) (Astronomy) the branch of astronomy dealing with the
origin and structure of the universe, including the
evolution of its present observable structure, using
the methods of observational astronomy as well as
mathematical physics.
[1913 Webster PJC]

2. a treatise dealing with the original and structure of the
universe.
[1913 Webster PJC]