/ vəˈlɒsəti; NAmE -ˈlɑːs-/ noun [ U , C ] ( pl. -ies )
1.
( technical ) the speed of sth in a particular direction :
the velocity of light
to gain / lose velocity
a high-velocity rifle
2.
( formal ) high speed :
Jaguars can move with an astonishing velocity.
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WORD ORIGIN
late Middle English : from French vélocité or Latin velocitas , from velox , veloc- swift.