SWIFT'NESS, noun Speed; rapid motion; quickness; celerity; velocity; rapidity. swiftness is a word of general import, applicable to every kind of motion, and to every thing that moves; as the swiftness of a bird; the swiftness of a stream; swiftness of descent in a falling body; swiftness of thought, etc.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.