noun, plural velocities.
rapidity of motion or operation; swiftness; speed: a high wind velocity.
Mechanics. the time rate of change of position of a body in a specified direction.
the rate of speed with which something happens; rapidity of action or reaction.

1540–50; < Latin vēlōcitās speed. See velocipede, -ty2

1. See speed. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
velocity (vɪˈlɒsɪtɪ)
n , pl -ties
1.  speed of motion, action, or operation; rapidity; swiftness
2.  physics u, v, w a measure of the rate of motion of a body expressed as the rate of change of its position in a particular direction with time. It is measured in metres per second, miles per hour, etc
3.  physics (not in technical usage) another word for speed
[C16: from Latin vēlōcitās, from vēlōx swift; related to volāre to fly]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1550, from L. velocitatem (nom. velocitas) "swiftness, speed," from velox (gen. velocis) "swift," of uncertain origin, perhaps related to vehere "carry" (see vehicle), or from the same root as vegetable (see vigil).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

velocity ve·loc·i·ty (və-lŏs'ĭ-tē)
Rapidity or speed of motion; specifically, the distance traveled per unit time.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
velocity  [%PREMIUM_LINK%]     (və-lŏs'ĭ-tē)  Pronunciation Key 
The speed and direction of motion of a moving body. Velocity is a vector quantity. Compare acceleration, speed.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

velocity definition

The vector giving the speed and direction of motion of any object.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Wheel-speed sensors and an accelerometer measure its velocity and a gyroscope
  controls equilibrium and direction.
The result is a riveting sensation of narrative velocity.
They do not suggest the narrative velocity and emotional and moral richness of
  what comes after that.
The velocity of the debate sped up during the last two years.
Image for velocity
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