[koz-mol-uh-jee] /kɒzˈmɒl ə dʒi/

the branch of philosophy dealing with the origin and general structure of the universe, with its parts, elements, and laws, and especially with such of its characteristics as space, time, causality, and freedom.
the branch of astronomy that deals with the general structure and evolution of the universe.
the philosophical study of the origin and nature of the universe
the branch of astronomy concerned with the evolution and structure of the universe
a particular account of the origin or structure of the universe: Ptolemaic cosmology

1825, from cosmology + -ical.

1650s, from Modern Latin cosmologia, from Greek kosmos (see cosmos) + -logia “discourse” (see -logy). Related: Cosmological; cosmologist.

They cannot scare me with their empty spaces
Between stars–on stars where no human race is.
I have it in me so much nearer home
To scare myself with my own desert places.

[Robert Frost, from “Desert Places,” 1936]


cosmology [(koz-mol-uh-jee)]

A system of beliefs that seeks to describe or explain the origin and structure of the universe. A cosmology attempts to establish an ordered, harmonious framework that integrates time, space, the planets, stars, and other celestial phenomena. In so-called primitive societies, cosmologies help explain the relationship of human beings to the rest of the universe and are therefore closely tied to religious beliefs and practices. In modern industrial societies, cosmologies seek to explain the universe through astronomy and mathematics. Metaphysics also plays a part in the formation of cosmologies. (See also under “Physical Sciences and Mathematics.”)
cosmology [(koz-mol-uh-jee)]

The branch of science dealing with the large-scale structure, origins, and development of the universe. (See astronomy and Big Bang theory.)


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  • Cosmological-constant

    noun, Astronomy. 1. a term introduced by Einstein into his field equations of general relativity to permit a stationary, nonexpanding universe: it has since been abandoned in most models of the universe.

  • Cosmological-principle

    noun, Astronomy. 1. the hypothesis that the universe is isotropic and homogeneous on a large scale: used to simplify the equations of general relativity for models of the universe. noun 1. (astronomy) the theory that the universe is uniform, homogenous, and isotropic, and therefore appears the same from any position

  • Cosmological-redshift

    noun, Astronomy. 1. the part of the redshift of celestial objects resulting from the expansion of the universe.

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