/ Dictionary / Index D direction angle: Meaning and Definition of Find definitions for: direc'tion an"gle Pronunciation: [key] — Math. Math. an angle made by a given vector and a coordinate axis. Cf. direction cosine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. directional signal direction cosine Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language