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sensor

noun [C]
 
 
/ˈsen.sər/ US  /-sɚ/

Definition

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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