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# velocity

## Definitions

### from The American Heritage® Dictionary of the English Language, 4th Edition

• n. Rapidity or speed of motion; swiftness.
• n. Physics A vector quantity whose magnitude is a body's speed and whose direction is the body's direction of motion.
• n. The rate of speed of action or occurrence.
• n. The rate at which money changes hands in an economy.

• n. A vector quantity that denotes the rate of change of position with respect to time, or a speed with the directional component.
• n. Rapidity of motion.
• n. The rate of occurrence.
• n. The number of times that an average unit of currency is spent during a specific period of time.

### from the GNU version of the Collaborative International Dictionary of English

• n. Quickness of motion; swiftness; speed; celerity; rapidity
• n. 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.

### from The Century Dictionary and Cyclopedia

• n. 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. Same as critical velocity .
• n. 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. Quickness of motion; speed in movement; swiftness; rapidity; celerity: used only (or chiefly) of inanimate objects. See def. 2.
• n. .2. 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.
• n. In music, decided rapidity of tempo or pace, particularly in a bravura passage.

• n. distance travelled per unit time

## Etymologies

### from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English velocite, from Old French, from Latin vēlōcitās, from vēlōx, vēlōc-, fast; see weg- in Indo-European roots.

From Latin vēlōcitās ("speed"), from vēlōx ("fast").

## Examples

• In 1899 Lenard demonstrated the cause to be the emission of electrons at a certain velocity from the negatively charged body.

Nobel Prize in Physics 1921 - Presentation Speech

• One of the things -- we're working on things like what we call velocity, which is the ability to turn the backlogs faster.

• And it's what we call the velocity of money still has to improve.

Get Briefed: Louis Navellier

• Hamels, who said his velocity is always down this early in the season, said location was his biggest problem, along with Colorado's thin air, which robbed him of his curveball and forced him to throw a steady diet of changeups, which he hung, and fastballs, which '' were right down the middle. ''

USATODAY.com

• The Earth's escape velocity is about 11 km per second.

Chris Lightfoot's quiz

• Opus Dei weirdican Ruth Kelly was unavailable for religious comment, as she was playing with her cilice, but BBC Weather Girl Carol Kirkwood said, "We advise people not to travel, as getting a frog in the face at terminal velocity is not likely to make for a good day".

More Weather Warnings for the UK

• But I do think that velocity is a important factor in penetration regardless of the caliber used as long as tough quality bullets are what actually strikes the animal.

Bullet performance

• Once terminal velocity is reached, the sensation of falling diminishes.

Is there a Feline Pesematologist in the house?

• Thus, one might deem that a particle's mass and charge are intrinsic properties, whilst its velocity is an extrinsic property, depending as it does upon the reference frame chosen.

Archive 2009-02-01

• Forget an explosives package, the kinetic energy of any hardware at orbital velocity is destructive in a collision.

Obama Seeks Space Weapon Ban - NASA Watch