Etymology
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sensor (n.)

"device giving a signal about some physical activity," 1947, from a shortened form of sensory (q.v.) or an agent noun in Latin form from sense (v.).

updated on May 05, 2022

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Definitions of sensor from WordNet

sensor (n.)
any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner;
Synonyms: detector / sensing element
From wordnet.princeton.edu, not affiliated with etymonline.