Definition

A device that detects or measures a physical condition, such as light, heat, or sound, and sends a signal based on that measurement.

Example

The smoke sensor alerted us to the fire in the building.

Conversation

Have you seen the new security system with the motion sensor?

Yeah, I heard it can detect movement from pretty far away.

It's really impressive how the sensor can differentiate between pets and people.

Totally! It makes home security so much smarter.

Synonyms & Antonyms

Root Explanation

Sensor → It is derived from the Latin root "sentire" (meaning to feel or perceive) and the suffix "-or" (indicating an agent or something that performs an action). A sensor is thus something that perceives or detects changes in the environment.

Memory Tip

Think of 'feeling' ('sentire') something to remember that a sensor is a device that detects or perceives changes.

Visually Confused Words