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Adjective: directional  dI'rek-shu-nul or di'rek-shu-nul
  1. Relating to or indicating directions in space
    "a directional microphone"
  2. Relating to direction toward a (nonspatial) goal
    "he tried to explain the directional trends of modern science"
  3. Showing the way by conducting or leading; imposing direction on
    "the directional role of science on industrial progress";
    - directing, directive, guiding

See also: leading

Antonym: omnidirectional

Encyclopedia: Directional