velocity (n.) Look up velocity at Dictionary.com
early 15c., from Latin velocitatem (nominative velocitas) "swiftness, speed," from velox (genitive velocis) "swift, speedy, rapid, quick," of uncertain origin, perhaps related to vehere "carry" (from PIE root *wegh- "to go, move, transport in a vehicle"), or from PIE *weg-slo-, suffixed form of root *weg- "to be strong, be lively."