English · Science & Technology
sensor
/ˈsɛn.sə/
[/ˈsɛn.sə/]
detecting device
Intermediatenoun
Definition
A device that detects changes such as light, heat, or movement and sends a signal.
Example
A motion sensor switches on the porch light whenever someone walks up to the front door.
A motion sensor switches on the porch light whenever someone walks up to the front door.
Etymology
From Latin 'sensus' (feeling, sense), from 'sentire' (to feel, perceive).
How & Where It’s Used
Used in phones, cars, security systems, and countless smart devices.