Etymology
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cosmic (adj.)

1640s, "worldly, of this world," a sense now obsolete, from Latinized form of Greek kosmikos "worldly, earthly, of the world," from kosmos "world-order, world" (see cosmos). Cosmical "related to the earth" is attested from 1580s. 

Modern sense of "of or pertaining to the universe," especially as conceived as subject to a harmonious system of laws, is from 1846. Meaning "related to or dealing with the cosmos, forming part of the material universe beyond the earth or the solar system" is from 1871. In reference to inconceivably vast space or protracted time, from 1874. Related: Cosmically.

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Definitions of cosmic

cosmic (adj.)
of or from or pertaining to or characteristic of the cosmos or universe;
cosmic catastrophe
cosmic rays
cosmic laws
cosmic (adj.)
inconceivably extended in space or time;
From wordnet.princeton.edu