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sensor

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sensor/ˈsɛnˌsoɚ, ˈsɛnsɚ/noun
pluralsensors
sensor
/ˈsɛnˌsoɚ, ˈsɛnsɚ/
noun
pluralsensors
Learner's definition of SENSOR  
[count]
: a device that detects or senses heat, light, sound, motion, etc., and then reacts to it in a particular way
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