/ Dictionary / Index A adjacent angles: Meaning and Definition of Find definitions for: adja'cent an'gles Pronunciation: [key] — Geom. Geom. two angles having the same vertex and having a common side between them. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. adjacent adjectival Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language