directional

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di|rec|tion|al /daɪr'ekʃənəl, dɪr-/
1 [ADJ]
If something such as a radio aerial, microphone, or loudspeaker is directional, it works most effectively in one direction, rather than equally in all directions at once. (TECHNICAL)
Dish aerials are highly directional...
2 [ADJ] usu ADJ n
Directional means relating to the direction in which something is pointing or going. (TECHNICAL)
Jets of compressed air gave the aircraft lateral and directional stability.

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