Definition of sensor noun from the Oxford Advanced Learner's Dictionary

 

sensor

 noun
noun
BrE BrE//ˈsensə(r)//
 
; NAmE NAmE//ˈsensər//
 
Devices
 
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a device that can react to light, heat, pressure, etc. in order to make a machine, etc. do something or show something security lights with an infrared sensor (= that come on when a person is near them) See related entries: Devices Word Origin 1950s: from sensory, on the pattern of motor.
See the Oxford Advanced American Dictionary entry: sensor