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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.

ccelerate our departure. Accelerated motion (Mech.), motion with a continually increasing velocity. -- Accelerating force, the force which causes accelerated motion. Nichol.

se of motion or action; as, a falling body moves toward the earth with an acceleration of velocity; -- opposed to retardation. A period of social improvement, or of intellectual advancement, contains within itself a principle of acceleration. I. Taylor. (Astr. & Physics.) Acceleration of the moon, the increase of the m…

Relating to acceleration; adding to velocity; quickening. Reid.

An apparatus for measuring the velocity imparted by gunpowder.

action (Physics), the product of the mass of a body by the space it runs through, and its velocity.

An instrument for measuring the force or velocity of the wind; a wind gauge.

The act or process of ascertaining the force or velocity of the wind.

-- Angular point, the point at which the sides of the angle meet; the vertex. -- Angular velocity, the ratio of anuglar motion to the time employed in describing.

also, the jarring or reflex motion caused in badly fitting machinery by irregularities in velocity or a reverse of motion.

of a mass of wood or other material suspended as a pendulum, for measuring the force and velocity of projectiles by means of the arc through which their impact impels it.

jectured as a result of calculation; as, the calculated place of a planet; the calculated velocity of a cannon ball.

A kind of short cannon, formerly in use, designed to throw a large projectile with small velocity, used for the purpose of breaking or smashing in, rather than piercing, the object aimed at, as the side of a ship. It has no trunnions, but is supported on its carriage by a bolt passing through a loop on its under side.…

tituted one for another in machinery, to produce a different but definite rate of angular velocity in an axis, as in cutting screws, gear, etc. -- To ring the changes on, to present the same facts or arguments in variety of ways.

An instrument for measuring minute intervals of time; used in determining the velocity of projectiles, the duration of short-lived luminous phenomena, etc.

A drag or brake applied to the wheels of a carriage, to check their velocity in going down a hill. Knight.

rrent of time, of events, of opinion, etc. Current meter, an instrument for measuring the velocity, force, etc., of currents. -- Current mill, a mill driven by a current wheel. -- Current wheel, a wheel dipping into the water and driven by the current of a stream or by the ebb and flow of the tide.

g about a calm center of low atmospheric pressure. This center moves onward, often with a velocity of twenty or thirty miles an hour.

A machine for measuring at any moment velocity of rotation, as of a wheel of a steam engine. Knight.

To start and run with velocity; to shoot rapidly along; as, the deer darted from the thicket.