plural of directional

Indicating direction. / Of or relating to guidance or help.

Something that indicates direction, such as a vehicle's turn signal.

plural of directness

(physics, electrical engineering) A measure of the performance of an antenna compared to an isotropic antenna; the ratio of the maximum value of radiation intensity to the average radiation intensity.

comparative form of direct: more direct

Archaic form of director.

Able to be directed.

plural of directivity

Providing adequate direction; directive