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classon

American  
[klas-on] / ˈklæs ɒn /

noun

Physics.

  1. the photon or graviton as the smallest discrete quantity of the electromagnetic and gravitational fields, respectively.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.