noun
sensor
SEHN-suh
noun
1
A device that detects a physical change or signal and responds or reports on it.
"The motion sensor turns the lights on automatically."
"A temperature sensor monitors the engine."
How to Use Sensor
Learner’s notesIn plain EnglishA device that detects something — light, motion, heat, pressure — and reports it.
Common pairings
motion sensor
light sensor
sensor detects
Word Forms
sensors plural
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The motion _____ turns the lights on automatically.
Etymology
Formed in the 1920s from Latin sentiō, "to feel," on the pattern of words like "motor."