GNU Collaborative International Dictionary of English

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Found one definition

1.       
   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]