The term MOST-Likely used to describe anything that spins at driveshaft speed and vibrates only once every revolution is:

Name: The term MOST-Likely used to describe anything that spins at driveshaft speed and vibrates only once every revolution is:
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First order vibration refers to a vibration that occurs once per revolution, which directly corresponds to the description of something that spins at driveshaft speed and vibrates only once every revolution.

The Term MOST-Likely Used to Describe Anything That Spins at Driveshaft