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Velocity   /vəlˈɑsəti/   Listen
noun
Velocity  n.  (pl. velocities)  
1.
Quickness of motion; swiftness; speed; celerity; rapidity; as, the velocity of wind; the velocity of a planet or comet in its orbit or course; the velocity of a cannon ball; the velocity of light. Note: In such phrases, velocity is more generally used than celerity. We apply celerity to animals; as, a horse or an ostrich runs with celerity; but bodies moving in the air or in ethereal space move with greater or less velocity, not celerity. This usage is arbitrary, and perhaps not universal.
2.
(Mech.) Rate of motion; the relation of motion to time, measured by the number of units of space passed over by a moving body or point in a unit of time, usually the number of feet passed over in a second. See the Note under Speed.
Angular velocity. See under Angular.
Initial velocity, the velocity of a moving body at starting; especially, the velocity of a projectile as it leaves the mouth of a firearm from which it is discharged.
Relative velocity, the velocity with which a body approaches or recedes from another body, whether both are moving or only one.
Uniform velocity, velocity in which the same number of units of space are described in each successive unit of time.
Variable velocity, velocity in which the space described varies from instant to instant, either increasing or decreasing; in the former case called accelerated velocity, in the latter, retarded velocity; the acceleration or retardation itself being also either uniform or variable.
Virtual velocity. See under Virtual. Note: In variable velocity, the velocity, strictly, at any given instant, is the rate of motion at that instant, and is expressed by the units of space, which, if the velocity at that instant were continued uniform during a unit of time, would be described in the unit of time; thus, the velocity of a falling body at a given instant is the number of feet which, if the motion which the body has at that instant were continued uniformly for one second, it would pass through in the second. The scientific sense of velocity differs from the popular sense in being applied to all rates of motion, however slow, while the latter implies more or less rapidity or quickness of motion.
Synonyms: Swiftness; celerity; rapidity; fleetness; speed.





Collaborative International Dictionary of English 0.48


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"Velocity" Quotes from Famous Books



... engaged in transporting downstream solid particles of rock, the product of weathering agencies in the area which they drain. Since the capacity of a stream to carry matter in suspension is proportional to its velocity, it follows that any circumstance tending to retard the rate of flow will induce deposition. Thus a fall in the gradient at any point in the course of a stream; any snag, projection or dam, impeding the current; the reduced velocity ...
— Project Gutenberg Encyclopedia
... Hachette's foundation of classification when he introduced six orders of machine elements and subdivided these into classes and species. His six orders were recepteurs (receivers of motion from the prime mover), communicateurs, modificateurs (modifiers of velocity), supports (e.g., bearings), regulateurs (e.g., governors), and operateurs, which produced the ...
— Kinematics of Mechanisms from the Time of Watt • Eugene S. Ferguson
... the course of the creek, etc., but when they saw the horse approaching they scampered off, and the bedizened warrior projected himself into the friendly branches of the nearest tree with the most astonishing velocity. Perceiving that it was useless to try to approach them, without actually running them to earth, we left them; and crossing the river easily over its stony bed, we continued north-west towards a mountain in the ranges that traversed the horizon in that direction. The river appeared ...
— Australia Twice Traversed, The Romance of Exploration • Ernest Giles
... rising, too, and there was no doubt that with darkness it would attain the velocity of a gale, and the storm the proportions of a sub-Arctic blizzard. Snow was already falling heavily, and presently it would be driving and swirling in dense, suffocating clouds. Winter had fallen like ...
— Bobby of the Labrador • Dillon Wallace
... were! You should speedily see a Historia Naturalis Americana, that would put the sneering imitators of the Frenchman, De Buffon, to shame! A great improvement might be made in the formation of all quadrupeds; especially those in which velocity is a virtue. Two of the inferior limbs should be on the principle of the lever; wheels, perhaps, as they are now formed; though I have not yet determined whether the improvement might be better applied to the ...
— The Prairie • J. Fenimore Cooper


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