of or pertaining to the cosmos: cosmic laws.
characteristic of the cosmos or its phenomena: cosmic events.
immeasurably extended in time and space; vast.
forming a part of the material universe, especially outside of the earth.
Also, cosmical.

1640–50; < Greek kosmikós worldly, universal, equivalent to kósm(os) world, arrangement + -ikos -ic

cosmicality [koz-mi-kal-i-tee] , noun
cosmically, adverb
intercosmic, adjective
noncosmic, adjective
noncosmically, adverb
precosmic, adjective
precosmical, adjective
precosmically, adverb

3. immense, enormous, stupendous. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cosmic (ˈkɒzmɪk)
1.  of or relating to the whole universe: cosmic laws
2.  occurring or originating in outer space, esp as opposed to the vicinity of the earth, the solar system, or the local galaxy: cosmic rays
3.  immeasurably extended in space or time; vast
4.  rare harmonious

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1640s; see cosmos. Originally "of this world;" sense of "of the universe" is from 1874.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
cosmic   (kŏz'mĭk)  Pronunciation Key 
Relating to the universe or the objects in it.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
As a result, should one be seen, scientists should be able to trace its path
  back to the distant cosmic event that spawned it.
Now that you know the basics of the seasons, see if you can identify the four
  days of the astronomical calendar on our cosmic map.
Space fans can today play a cosmic slot machine to help astronomers understand
  the biggest pile-ups in the universe.
Plus, being exposed to cosmic radiation for years and years and years cannot be
  a good lifestyle choice.
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