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English to English noun
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a rate (usually rapid) at which something happens |  | Example: 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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