Definition of directional
1
: of, relating to, or indicating direction in space:
a
: suitable for detecting the direction from which radio signals come or for sending out radio signals in one direction only
a directional antenna
b
: operating most effectively in a particular direction
a directional microphone
2
: relating to direction or guidance especially of thought or effort
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Merriam-Webster unabridged
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Time Traveler for directional
The first known use of directional was in 1842
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