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a combining form meaning “world,” “universe,” used in the formation of compound words: cosmography; in contemporary usage, sometimes representing Russian kosmo-, it may mean “outer space,” “space travel,” or “cosmic ray”:
Also, especially before a vowel, cosm-.
Compare astro-.
Origin of cosmo-
< Greek kosmo-, combining form of kósmos cosmos Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for cosmo-


combining form
indicating the world or universe: cosmology, cosmonaut, cosmography
Word Origin
from Greek: cosmos
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for cosmo-

before a vowel cosm-, word-forming element from Latinized form of Greek kosmos (see cosmos). In older use, "the world, the universe;" since 1950s, especially of outer space.

Online Etymology Dictionary, © 2010 Douglas Harper
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