From The Collaborative International Dictionary of English v.0.44 [gcide]:
Cosmic \Cos"mic\ (k?z"m?k), Cosmical \Cos"mic*al\ (-m?-kal), adjective [Gr. kosmiko's of the world, fr. ko'smos: cf. F. cosmique. See {Cosmos}.]
1. Pertaining to the universe, and having special reference to universal law or order, or to the one grand harmonious system of things; hence; harmonious; orderly.
2. Pertaining to the solar system as a whole, and not to the earth alone.
3. Characteristic of the cosmos or universe; inconceivably great; vast; as, cosmic speed. ''Cosmic ranges of time.'' --Tyndall.
4. (Astron.) Rising or setting with the sun; -- the opposite of {acronycal}.
5. of unsurpassed size, extent, or significance; vast; as, of cosmic proportions; of cosmic importance. [PJC]
From WordNet (r) 2.0 [wn]:
adjective
1: of or from or pertaining to or characteristic of the cosmos or universe; "cosmic laws"; "cosmic catastrophe"; "cosmic rays"
2: inconceivably extended in space or time
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
39 Moby Thesaurus words for "cosmic": Gargantuan, amplitudinous, astronomical, awesome, boundless, bulky, colossal, cosmogonal, cosmogonic, cosmologic, enormous, extensive, galactic, gigantic, huge, immeasurable, immense, infinite, king-size, large, mammoth, massive, massy, monster, monstrous, monumental, mountainous, outsize, overgrown, prodigious, sizable, spacious, stupendous, titanic, tremendous, universal, vast, voluminous, weighty
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