swiftness Meaning, Definition & Usage

  1. noun a rate (usually rapid) at which something happens
    speed; fastness.
    • the project advanced with gratifying speed

WordNet

Swift"ness noun
Definitions
  1. The quality or state of being swift; speed; quickness; celerity; velocity; rapidity; as, the swiftness of a bird; the swiftness of a stream; swiftness of descent in a falling body; swiftness of thought, etc.

Webster 1913