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sensor

The definition of a sensor is a tool that is designed to detect something and then to respond by taking a specific action.

(noun)

An example of a sensor is how a GPS picks up a signal and relays that information in the form of directions.

See sensor in Webster's New World College Dictionary

noun

any of various devices designed to detect, measure, or record physical phenomena, as radiation, heat, or blood pressure, and to respond, as by transmitting information, initiating changes, or operating controls

Origin: < L sensus, pp. of sentire, sense + -or

See sensor in American Heritage Dictionary 4

noun

A device, such as a photoelectric cell, that receives and responds to a signal or stimulus.
See sense organ.

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