Meaning & use
tachometer
Last updated
an instrument that measures the rotational speed of a shaft or engine, usually displayed in revolutions per minute.
See it in a sentence
The driver watched the tachometer to know when to shift gears.
A red line on the tachometer warns when the engine is spinning too fast.
A note on using this word
Not to be confused with a speedometer, which measures a vehicle's road speed rather than its engine speed.
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