/ Dictionary / Index A astronomy: Meaning and Definition of Find definitions for: as•tron•o•my Pronunciation: (u-stron'u-mē), [key] — n. the science that deals with the material universe beyond the earth's atmosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: astronomy (Thesaurus) astronomical year astrophotography Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language