/ Dictionary / Index R right angle: Meaning and Definition of Find definitions for: right' an'gle Pronunciation: [key] the angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one quarter of the circle; the angle formed by two perpendicular lines that intersect; an angle of 90°. See diag. under. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. right about face right ascension Related Content Daily Word Quiz: tranquil Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language