Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: French
Origin: vélocité, from Latin velocitas, from velox 'fast'

velocity

 noun
     
ve‧lo‧ci‧ty plural velocities
1 [uncountable and countable] technical the speed of something that is moving in a particular direction:
the velocity of light
The speedboat reached a velocity of 120 mph.
2 [uncountable] a high speed:
Martinez had good velocity on his fastball.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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