An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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instantaneous acceleration
  شتاب ِ لحظه‌ای  
šetâb-e lahze-yi
Fr.: accélération instantanée  

The → acceleration of a particle at time t defined by a = lim Δv/Δt = dv/dt. It is the limiting value of Δv/Δt at time t as both Δv and Δt approach zero.

See also: → instantaneous; → acceleration.