directional -
relating to direction toward a (nonspatial) goal; "he tried to explain the directional trends of modern science"
directional -
showing the way by conducting or leading; imposing direction on; "felt his mother's directing arm around him"; "the directional role of science on industrial progress"
directional Relating to or indicating directions in space.
directional A blinking light mounted near the left and right front and rear corners of a vehicle, and sometimes on the sides, used to indicate the intention of a lateral change of position (turn or lane change).