/ Dictionary / Index D directional: Meaning and Definition of Find definitions for: di•rec•tion•al Pronunciation: (di-rek'shu-nl, dī-), [key] — adj. of, pertaining to, or indicating direction in space. adapted for determining the direction of signals received, or for transmitting signals in a given direction: a directional antenna. of, pertaining to, or providing guidance or leadership. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: directional (Thesaurus) direction directional derivative 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