velocity (English)

Where does "velocity" come from?

The English noun 'velocity' entered the language from Middle French 'vélocité', which itself derives from the Latin noun 'vēlōcitās' meaning 'speed'[1]. The Latin term stems from 'vēlōx' meaning 'swift or quick', combined with the suffix '-tās'[2]. Further back, the Latin 'vēlōx' is traced to the Proto-Indo-European root '*h₂weh₁-' meaning 'to blow', originally connecting the concept to the speed of wind[3]. Through these transitions, the word maintained its core association with rapidity and motion, and it forms a doublet with 'veloce'[1].

Open questions

• Older theories derive the Latin source word from a different Proto-Indo-European root meaning to bring or transport. [3]

Full etymology tree

• velocity (English), 'A vector quantity that denotes the rate of change of position with respect to time, combining speed with a directional component.'
  • derived vélocité (Middle French)
    • borrowed velocitas (Latin), 'speed, velocity, swiftness, rapidity, fleetness'
      • suffix velox (Latin), 'swift, quick, fleet, rapid, speedy'
      • suffix -tas (Latin), '-ty, -dom, -hood, -ness, -ship; Used to form feminine abstract nouns indicating a state of being.'

Ancestors

• velocitas (Latin)

Cognates and doublets

• veloce (English)

Descendants and derived words

• constant velocity (English)
• four-velocity (English)
• root mean square velocity (English)
• velocimeter (English)
• velocity curve (English)
• velocity dispersion (English)
• velocity potential (English)

Related words

• time (English)

Sources

1. velocity (English) - Wiktionary
2. velocitas (Latin) - Wiktionary
3. velox (Latin) - Wiktionary

Updated October 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris