Pronunciation: (vu-los'i-tē), [key]
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.