Definition

A device that measures how fast something is rotating, usually in terms of rotations per minute.

Example

The mechanic used a tachometer to check the engine's speed.

Conversation

Have you ever checked the tachometer in your car?

Yeah, it’s interesting to see how fast the engine is spinning.

I find it fascinating how it helps monitor performance.

Definitely, it's essential for keeping everything running smoothly.

Synonyms & Antonyms

Root Explanation

Tachometer → It is formed from "tachy-" (from Greek "tachys", meaning swift or fast) and "metron" (meaning measure). The word "tachometer" refers to an instrument that measures speed or rate, particularly the speed of rotation.

Memory Tip

Think of 'swift' ('tachy-') to remember that a tachometer measures speed.

Visually Confused Words