Meaning of SENSOR in English

/ ˈsensə(r); NAmE / noun

a device that can react to light, heat, pressure, etc. in order to make a machine, etc. do sth or show sth :

security lights with an infrared sensor (= that come on when a person is near them)



1950s: from sensory , on the pattern of motor .

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