Definition of swiftness noun from the Oxford Advanced Learner's Dictionary

 

swiftness

 noun
noun
BrE BrE//ˈswɪftnəs//
 
; NAmE NAmE//ˈswɪftnəs//
 
[uncountable]
 
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the fact of happening or being done very quickly or in a very short time He moved with surprising swiftness for a man of his age. These technological changes happened with astonishing swiftness.