directional \directional\ adj.
1. of or pertaining to direction (definition 2).
[WordNet 1.5]
2. serving to indicate direction.
[PJC]
3. (Radio) 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; as, a
directional antenna.
[PJC]
Source: The Collaborative International Dictionary of English v.0.48
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