Meaning of DIRECTIONAL in English

DIRECTIONAL

/ dəˈrekʃənl; NAmE ; dɪ-; daɪ-/ adjective ( technical )

1.

producing or receiving signals, sound, etc. better in one particular direction :

a directional microphone / aerial

2.

connected with the direction in which sth is moving :

directional stability

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.