proximity sensor
nounUK /prɒkˈsɪmɪti ˈsɛnsə/
US /prɑːkˈsɪməti ˈsɛnsər/
A proximity sensor is a small part that can tell when something is close to it.
When you hold your phone to your ear, the proximity sensor turns off the screen.
RELATED WORDS
OTHER MEANINGS
2. A device in a car that warns you when you get too close to something.
The car's proximity sensor beeped as we backed into the parking space.
3. A part in a robot that helps it avoid bumping into things.
The robot stopped because its proximity sensor felt the wall ahead.
4. A feature that turns a screen off when your face is near it.
The proximity sensor keeps your cheek from tapping buttons during a call.