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English to English noun 1. a rate (usually rapid) at which something happens  the project advanced with gratifying speed source: wordnet30
2. 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.  source: webster1913
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