'Swiftness' definitions:

Definition of 'swiftness'

From: WordNet
noun
A rate (usually rapid) at which something happens; "the project advanced with gratifying speed" [syn: speed, swiftness, fastness]

Definition of 'Swiftness'

From: GCIDE
  • Swiftness \Swift"ness\, n. 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. [1913 Webster]