group speed

British

noun

physics the speed at which energy is propagated in a wave. This is the quantity determined when one measures the distance which the radiation travels in a given time. In a medium in which the speed increases with wavelength the group speed is less than the phase speed, and vice versa

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

I received notification that I could take a group speed awareness course or receive a fine and three points on my licence, which was clean at the time.

From BBC

“It’s a versatile group — speed, power and quickness. “And we’re pretty big too.”

From Seattle Times

Faulconer agreed then to have the advisory group speed up its work.

From Washington Times

It was impossible to determine the size of each image of the group, speed, or altitude.

From Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023