Definition of tachometer noun from the Oxford Advanced Learner's Dictionary

 

tachometer

 noun
noun
BrE BrE//ˈkɒmɪtə(r)//
 
; NAmE NAmE//ˈkɑːmɪtər//
 
 
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a device that measures the rate that something turns and is used to measure the speed of an engine in a vehicle
See the Oxford Advanced American Dictionary entry: tachometer