velocity

Etymology

From Middle French vélocité, from Latin vēlōcitās (“speed”), from vēlōx (“fast”), thus a doublet of veloce.

noun

1. (physics) A vector quantity that denotes the rate of change of position with respect to time, combining speed with a directional component.
   A car racing in a circle may retain the same speed while continually changing its velocity.
2. Rapidity of motion.
   The train was travelling at a slower velocity than usual.
3. The rate of occurrence.
4. (economics) The number of times that an average unit of currency is spent during a specific period of time.