adjective 1.of, pertaining to, or indicating
direction in space.
2.Radio. adapted for determining the
direction of signals received, or for transmitting signals in a given
direction:
a directional antenna. 3.of, pertaining to, or providing guidance or
leadership.
Related forms di·rec·tion·al·i·ty, noun
di·rec·tion·al·ly, adverb
un·di·rec·tion·al, adjective