speed

The rate or a measure of the rate of motion, especially.

Distance traveled divided by the time of travel.

The limit of this quotient as the time of travel becomes vanishingly small; the first derivative of distance with respect to time.

The magnitude of a velocity.

Swiftness of action.

The act of moving rapidly.

The state of being in rapid motion; rapidity.

A transmission gear or set of gears in a motor vehicle.