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[vuh-los-i-tee] /vəˈlɒs ɪ ti/
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.
Origin of velocity
First recorded in 1540-50, velocity is from the Latin word vēlōcitās speed. See velocipede, -ty2
1. See speed. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for velocity


noun (pl) -ties
speed of motion, action, or operation; rapidity; swiftness
(physics) 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 u, v, w
(physics) (not in technical usage) another word for speed (sense 3)
Word Origin
C16: from Latin vēlōcitās, from vēlōx swift; related to volāre to fly
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for velocity

1550a, from Latin velocitatem (nominative velocitas) "swiftness, speed," from velox (genitive 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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velocity in Medicine

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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velocity in Science
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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velocity in Culture

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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