/ Dictionary / Index A astronomical year: Meaning and Definition of Find definitions for: as'tronom'ical year' Pronunciation: [key] year (def. 4b). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. astronomical unit astronomy 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