/veuh los"i tee/ , n. , pl. velocities .
1. rapidity of motion or operation; swiftness; speed: a high wind velocity.
2. Mech. the time rate of change of position of a body in a specified direction.
3. the rate of speed with which something happens; rapidity of action or reaction.
[ 1540-50; velocitas speed. See VELOCIPEDE, -TY 2 ]
Syn. 1. See speed .