velocity

1. (physics) A vector quantity that denotes the rate of change of position with respect to time, combining speed with a directional component.Examples: "A car racing in a circle may retain the same speed while continually changing its velocity."; "Usually, however, confluence is associated with an increase in air velocity and diffluence with a decrease. In the intermediate case, confluence is balanced by an increase in wind velocity and diffluence by a decrease in velocity."; "Such angular distances imply undecelerated ejecta knot transverse velocities of 15,600 and 12,700 km/s respectively, assuming an explosion date ~1670 AD and a distance of 3.4 kpc."countableuncountable

2. (economics) The number of times that an average unit of currency is spent during a specific period of time.countableuncountable

3. (music hardware and software) The value corresponding to how hard a key is struck on a MIDI controller or keyboard.countableuncountable