particles moving at high velocities
measuring the velocity of sound
the velocity of a bullet
Recent Examples on the WebIf all goes according to plan, Starship will accelerate to nearly 17,000 mph, just shy of the velocity required to reach a stable orbit around Earth.—Stephen Clark, Ars Technica, 17 Nov. 2023 In the day’s first game, his outing on the mound had ended early, after an inning and a third—his velocity was down, the shape of his pitches not quite right.—Louisa Thomas, The New Yorker, 23 Sep. 2023 The average exit velocity off him was just 85.7 mph.—Jacob Calvin Meyer, Baltimore Sun, 13 Sep. 2023 Because space junk can move at extraordinary velocities, a floating screw might pack a destructive punch equivalent to a small bomb.—Jon Gertner, New York Times, 8 Nov. 2023 However, his fastball velocity waned over the season’s final month.—Jack Harris, Los Angeles Times, 3 Nov. 2023 Janes reports that crucial details of the weapon, like muzzle velocity and projectile weight, are being kept confidential.—Kelsey D. Atherton, Popular Science, 1 Nov. 2023 This gives the train a starting velocity of 27 meters per second, or 60 miles per hour.—WIRED, 29 Sep. 2023 With runners on the corners and one out in the second inning, Aaron Hicks bounced an infield single (exit velocity: 78 miles per hour) just over the glove of Bello to score one run.—Alex Speier, BostonGlobe.com, 10 Sep. 2023 See More
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Middle English velocite, borrowed from Anglo-French & Latin; Anglo-French veloceté, borrowed from Latin vēlōcitāt-, vēlōcitās, from vēlōc-, vēlōx "swift, rapid" (of uncertain origin) + -itāt-, -itās-ity
If going back to earlier *ueg-s-l-o-, perhaps a derivative from the base of vegēre "to give vigor to, enliven" (see vegetate) or vehere "to convey" (Indo-European *u̯eǵh-; see vehicle), assimilated to the -ōk- of ātrōx, ferōx (see atrocious, ferocious). Alternatively, a derivative *uē-lo-, from the Indo-European base *h2u̯eh1- "blow" (hence, "windlike"; see wind entry 1) has been suggested.