Meaning of DIRECTIONAL in English
adj. 1 of or indicating direction. 2 Electronics a concerned with the transmission of radio or sound waves in a particular direction. b (of equipment) designed to receive radio or sound waves most effectively from a particular direction or directions and not others. directionality n. directionally adv.
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012