# velocity

## Definitions

• WordNet 3.6
• n velocity distance travelled per unit time
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Webster's Revised Unabridged Dictionary
• Interesting fact: The anemometer is an instrument which measures the force, velocity, or pressure of the wind.
• Velocity 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.
• Velocity (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.
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Century Dictionary and Cyclopedia
• Interesting fact: The first manager of the Seattle Space Needle, Hoge Sullivan, was acrophobic - fearful of heights. The 605 foot tall Space Needle is fastened to its foundation with 72 bolts, each 30 feet long. The Space Needle sways approximately 1 inch for every 10 mph of wind. It was built to withstand a wind velocity of 200 miles-per-hour.
• n velocity The velocity at which the mode of flow of a liquid, in a pipe or channel, is modified by the setting up of eddy-motion and the consequent interruption of the stream lines.
• n velocity Same as critical velocity .
• n velocity The velocity of a given individual wave-length of light as opposed to the group velocity of a complex beam taken as a whole.
• n velocity Quickness of motion; speed in movement; swiftness; rapidity; celerity: used only (or chiefly) of inanimate objects. See def. 2.
• n velocity In physics, rate of motion; the rate at which a body changes its position in space; the rate of change of position of a point per unit of time. The velocity of a body is uniform when it passes through equal spaces in equal times, and it is variable when the spaces passed through in equal times are unequal. The velocity of a body is accelerated when it passes constantly through a greater space in equal successive portions of time, as is the case with falling bodies under the action of gravity, and it is retarded when a less space is passed through in each successive portion of time. When the motion of a body is uniform its velocity is measured by the space described by it in a unit of time, as one second. If the motion of the body is not uniform its velocity is measured by the space which it would describe uniformly in a given time if the motion became and continued uniform from that instant of time.
• n velocity In music, decided rapidity of tempo or pace, particularly in a bravura passage.
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Chambers's Twentieth Century Dictionary
• Interesting fact: The highest wind velocity ever recorded in the United States was 231 miles per hour, on Mount Washington, New Hampshire, in 1934.
• n Velocity vē-los′i-ti swiftness: speed: rate of change of position of a point per unit of time
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## Etymology

Webster's Revised Unabridged Dictionary
L. velocitas, from velox, -ocis, swift, quick; perhaps akin to volare, to fly (see Volatile): cf. F. vélocité,
Chambers's Twentieth Century Dictionary
L. velocitasvelox, swift.

## Usage

### In literature:

We should get some eastward velocity at 32,000 feet.
"Space Tug" by Murray Leinster
On any vertical the mid-depth velocity was greater than the mean, and the bed velocity was the least.
"Scientific American Supplement, No. 365, December 30, 1882" by Various
But the force of this stream is not as the velocity, but as the square of the velocity.
"Outlines of a Mechanical Theory of Storms" by T. Bassnett
With a mere raft this is an almost incredible velocity.
"A Journey to the Centre of the Earth" by Jules Verne
The shrapnel has sufficient velocity at 2,000 yards to disable men and horses.
"Ordnance Instructions for the United States Navy." by Bureau of Ordnance, USN
We seemed to be dropping from an immeasurable height and with an inconceivable velocity, straight down upon those giant peaks.
"Edison's Conquest of Mars" by Garrett Putman Serviss
In 71 cases of joint wounds, 66 were due to low velocity shrapnel and only 5 to high velocity bullets.
"Kelly Miller's History of the World War for Human Rights" by Kelly Miller
In the early sixties we believed in velocity and clearness and brilliancy.
"Old Fogy" by James Huneker
High in the sky, came the whining whistle of an approaching ship, coming at terrific velocity.
"Invaders from the Infinite" by John Wood Campbell
Because of an increased velocity of bow displacement at a reduced speed of boat.
"History of Steam on the Erie Canal" by Anonymous
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### In news:

The Model 1108 SS Atto Super Air Nozzle has been engineered for precise blowoff with efficient, high-volume, high-velocity airflow.
I have no doubt that Hughes can learn to pitch with reduced velocity.
And that, above all, is velocity.
Alexander said it caused him to lose some velocity on his fastball but helped out with his curve, which Coughlin hitters swung over top of most of the day.
John Kraman of Rockford, Ill. Is consignment director for Mecum Auctions and on-air analyst of Mecum Muscle Cars & More on Discovery's Velocity Network.
Depressions are measured in terms of unemployment, monetary velocity, bankruptcies, and the like.
The man walked into Veloce Velo, 98 Front St S.
Velocity Micro Raptor Signature Edition.
5 reasons why the Courier-Journal's Velocity fails.
The Velocity Elite 18-and-under softball team earned the championship at the Roxborough Impact Fall Bash.
Microsoft this week rolled out the next community test version of a distributed cache platform code-named " Velocity " that promises to speed up.NET-based applications.
Velocity CTP3 (Community Technology Preview 3) was published on Tuesday and can be downloaded here.
Velocity reports on challenging (mostly local) road rides and races.
True to the Velocity series, ultra-affordable doesn't mean you have to sacrifice protection, versatility, style, or summer comfort.
Supply Chain Council Appoints Avnet Velocity Executive.
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### In science:

Is it the group velocity, the phase velocity, or the velocity of light in pure vacuum? As we have seen these quantities differ in the early universe in an essential way.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
If we keep the deﬁnition of velocity as the derivative of the coordinate with respect to x0 , then the group velocity of the ﬁeld is given by the derivative of p0 with respect to p1 , and it is greater than the velocity of light.
Localized Propagating Tachyons in Extended Relativity Theories
Here u is an ob ject’s velocity observed in S , and u′ the velocity observed in S ′ , whereas v is the relative velocity between S and S ′ .
Localized Propagating Tachyons in Extended Relativity Theories
These dependences induce a net rotation in the radius-velocity plane between the correlations with effective radius and circular velocity in the disk galaxy progenitors, and the correlations with effective radius and velocity dispersion in the elliptical galaxy remnants.
The Effect of Major Mergers on Age and Metallicity Across the Fundamental Plane
However, the velocities from the WIYN/Hydra appear systematically 5–15 km s−1 more negative than velocities from WIRO for constant-velocity systems having suﬃcient data from both observatories to make this comparison.
A Fresh Catch of Massive Binaries in the Cygnus OB2 Association
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