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”:
indicating the world or universe: cosmology, cosmonaut, cosmography
Word Origin
from Greek: cosmos
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.