/ Dictionary / Index A angular diameter: Meaning and Definition of Find definitions for: an'gular diam'eter Pronunciation: [key] — Astron. Astron. the angle that the apparent diameter of a celestial object subtends at the eye of the observer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. angular acceleration angular dispersion Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language