An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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deceleration
  واشتاب  
vâšetâb (#)
Fr.: décéleration  

The act or process of moving, or of causing to move, with decreasing speed. Sometimes called negative acceleration.

See also: Verbal noun of decelerate.