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English definition of “sensor”

sensor

noun [C]     /ˈsen.sər/ US  /-sɚ/
a device that is used to record that something is present or that there are changes in something: The security device has a heat sensor which detects the presence of people and animals.Weighing, measuring and counting devices
(Definition of sensor noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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