This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or indicating direction: an automobile's directional lights.

adj. Electronics Capable of receiving or sending signals in one direction only.

adj. Relating to guidance in effort, behavior, or thought: directional training.

adj. Serving to point the future direction, as of fashion: "A directional group of sweater knit colors are winter pastels” ( Women's Wear Daily).

n. A directional signal.

adj. Indicating direction.

adj. Of or relating to guidance or help.

n. Something that indicates direction, such as a turn signal.

adj. of or pertaining to direction (definition 2).

adj. serving to indicate direction.

adj. transmitting radio signals in a specific direction, or receiving signals only from a narrow angle of directions, thus serving to indicate the direction from which radio signals are coming. Used of antennas.

Pertaining or relating to direction.

adj. relating to direction toward a (nonspatial) goal

adj. relating to or indicating directions in space

adj. showing the way by conducting or leading; imposing direction on

"One of the objects of this invention is to provide a tank having an extensible leg capable of imparting a series of vertical oscillations to the tank, and having means to vary the angle of inclination of the leg to obtain directional movement of the tank."

leading   

direct   

correctional    sectional   

navigational    optical    magnetic    top-down    bearish    long-range    omnidirectional    hand-held    short-term    built-in