What context can I use each word in?
Learn when and how to use these words with these examples!
tachymeter
Example
The tachymeter on my watch allows me to calculate my running speed. [tachymeter: noun]
Example
The mechanic used a tachymeter to measure the rotational speed of the engine. [tachymeter: noun]
speedometer
Example
The speedometer on my car showed that I was driving over the speed limit. [speedometer: noun]
Example
The pilot checked the speedometer to ensure the plane was flying at a safe speed. [speedometer: noun]
Good things to know
Which word is more common?
Speedometer is more commonly used than tachymeter in everyday language. Speedometer is a standard feature in most vehicles, while tachymeter is less common and mainly used in sports and racing watches.
What’s the difference in the tone of formality between tachymeter and speedometer?
Both tachymeter and speedometer are technical terms and are typically used in formal contexts, such as engineering and physics.
