An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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group velocity
  تندای ِ گروه  
tondâ-ye goruh
Fr.: vitesse de groupe  

The velocity at which the envelope of a → wave packet propagates, vgr = dω/dk, at k0 (the central value of k). The group velocity can be equal to, larger, or smaller than the → phase velocity.

See also: → group; → velocity.