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speed,

change in distance with respect to time. Speed is a scalar rather than a vectorvector,
quantity having both magnitude and direction; it may be represented by a directed line segment. Many physical quantities are vectors, e.g., force, velocity, and momentum.
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 quantity; i.e., the speed of a body tells one how fast the body is moving but not the direction of the motion. If during time t a body travels over a distance s, then the average speed of that body is equal to s/t. The speed and direction of a body's motion together determine the body's velocityvelocity,
change in displacement with respect to time. Displacement is the vector counterpart of distance, having both magnitude and direction. Velocity is therefore also a vector quantity. The magnitude of velocity is known as the speed of a body.
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Speed

The time rate of change of position of a body without regard to direction. It is the numerical magnitude only of a velocity and hence is a scalar quantity. Linear speed is commonly measured in such units as meters per second, miles per hour, or feet per second.

Average linear speed is the ratio of the length of the path traversed by a body to the elapsed time during which the body moved through that path. Instantaneous speed is the limiting value of the foregoing ratio as the elapsed time approaches zero. See Velocity

speed

[spēd]
(graphic arts)
The sensitivity of a photographic film, expressed according to one of several scales.
(mechanics)
The time rate of change of position of a body without regard to direction; in other words, the magnitude of the velocity vector.
(optics)
The light-gathering power of a lens, expressed as the reciprocal of the f number.
The time that a camera shutter is open.
(physics)
In general, the rapidity with which a process takes place.

Speed

an “illiterate loiterer”; slow-moving servant. [Br. Lit.: Two Gentlemen of Verona]

speed

1. Physics
a. a scalar measure of the rate of movement of a body expressed either as the distance travelled divided by the time taken (average speed) or the rate of change of position with respect to time at a particular point (instantaneous speed). It is measured in metres per second, miles per hour, etc.
b. (not in technical usage) another word for velocity
2. a rate of rotation, usually expressed in revolutions per unit time
3. a gear ratio in a motor vehicle, bicycle, etc.
4. Photog a numerical expression of the sensitivity to light of a particular type of film, paper, or plate
5. Photog a measure of the ability of a lens to pass light from an object to the image position, determined by the aperture and also the transmitting power of the lens. It increases as the f-number is decreased and vice versa
6. a slang word for amphetamine

SPEED

Early system on LGP-30. Listed in CACM 2(5):16 (May 1959).
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Amtrak also will require that the manufacturer of high speed trains for the Northeast also develop non-electric high speed locomotives.
Success on the Northeast Corridor will generate political support for Amtrak operation of high speed train service in other parts of the country.
Parsons is proud to be a founding member of the Association for California High Speed Trains," stated Jim Shappell, Parsons Group President.
The Association for California High Speed Trains (ACHST) seeks to educate and inform the public, business community, and government officials about the benefits of high speed rail for all Californians.
AOL High Speed - Powered by Clearwire connects to the Internet using licensed spectrum and eliminates the confines of traditional cable or phone wiring.
The Elite service is available in the company's traditional incumbent local exchange area, in those areas where high speed Internet service is available.
4 million high speed DSL Internet lines in service, AT&T is the nation's largest high speed DSL Internet provider, adding more than 1.
High Speed Internet customers receive a leading combination of broadband access, services and content that provides a unique high speed Internet experience.
The online offer is available in the company's traditional 13-state service area, where high speed Internet service is available.
AOL will introduce a nationwide advertising campaign to build excitement among AOL members and others who want to upgrade from dial-up to AOL High Speed to receive the benefits of a high-speed connection plus the AOL service.