- rapidity of motion or operation; swiftness; speed: a high wind velocity.
- the time rate of change of position of a body in a specified direction.
- the rate of speed with which something happens; rapidity of action or reaction.
- speed of motion, action, or operation; rapidity; swiftness
- a measure of the rate of motion of a body expressed as the rate of change of its position in a particular direction with time. It is measured in metres per second, miles per hour, etc
- physics (not in technical usage) another word for speed (def. 3)
