Usually means: Speed at which waves propagate.
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We found 12 dictionaries that define the word group velocity:

General (7 matching dictionaries)
  1. group velocity: Merriam-Webster
  2. group velocity: Oxford Learner's Dictionaries
  3. group velocity: Collins English Dictionary
  4. group velocity: Wiktionary
  5. group velocity: Infoplease Dictionary
  6. group velocity: Dictionary.com
  7. Group velocity: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. group velocity: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (1 matching dictionary)
  1. Group Velocity: Eric Weisstein's World of Physics

Tech (2 matching dictionaries)
  1. Glossary of Meteorology (No longer online)
  2. National Weather Service Glossary (No longer online)

Definitions from Wiktionary (group velocity)

noun:  (physics) the propagation velocity of the envelope of a modulated travelling wave, which is considered as the propagation velocity of information or energy contained in it.

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