velocity

Rapidity or speed of motion; swiftness.

A vector quantity whose magnitude is a body’s speed and whose direction is the body’s direction of motion.

The rate of speed of action or occurrence.

The rate at which money changes hands in an economy.

Quickness of motion; speed in movement; swiftness; rapidity; celerity: used only (or chiefly) of inanimate objects. See def. 2.

.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.

In music, decided rapidity of tempo or pace, particularly in a bravura passage.

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.

Same as critical velocity .