Definition of directional adjective from the Oxford Advanced American Dictionary

     

    directional

     adjective
    adjective
    NAmE//dəˈrɛkʃənl//
     
    , NAmE//daɪˈrɛkʃənl//
     
    (technology)
     
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  1. 1producing or receiving signals, sound, etc. better in one particular direction a directional microphone/aerial
  2. 2connected with the direction in which something is moving directional stability
See the Oxford Advanced Learner's Dictionary entry: directional