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/təˈkɒmətə(ɹ)/ · noun
A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile..
Use tachometer when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Tachometer means A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile..
Common synonyms include rev counter, tach.
The opposite depends on the specific sense.
Use tachometer where its definition matches the intended context.
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