/ Dictionary / Index V vertical circle: Meaning and Definition of Find definitions for: ver'tical cir'cle Pronunciation: [key] — Astron. Astron. a great circle on the celestial sphere passing through the zenith. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. vertical angle vertical combination Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language