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1.
It's what ignorant police and newscasters say to sound important when they should really say "speed", as in " the car was traveling at a high rate of speed."
These people will often say " at this point in time" rather than "now. "
The car was traveling at a high rate of speed.
by EcceFelix July 06, 2014

Words related to rate of speed

fast regid spade slow speed velocity