/ Dictionary / Index I interior angle: Meaning and Definition of Find definitions for: inte'rior an'gle Pronunciation: [key] — Geom. Geom. an angle formed between parallel lines by a third line that intersects them. an angle formed within a polygon by two adjacent sides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. interior interior decoration Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language