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fermion

[fur-mee-on]
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noun Physics.
  1. any particle that obeys the exclusion principle and Fermi-Dirac statistics; fermions have spins that are half an odd integer: 1/2, 3/2, 5/2, …
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Origin of fermion

First recorded in 1945–50; fermi + (mes)on
Related formsfer·mi·on·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for fermion

fermion

noun
  1. any of a group of elementary particles, such as a nucleon, that has half-integral spin and obeys Fermi-Dirac statisticsCompare boson
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Word Origin

C20: named after Enrico Fermi; see -on
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

fermion in Science

fermion

[fûrmē-ŏn′, fĕr-]
  1. An elementary or composite particle, such as an electron, quark, or proton, whose spin is an integer multiple of 12. Fermions act on each other by exchanging bosons and are subject to the Pauli exclusion principle, which requires that no two fermions be in the same quantum state. Fermions are named after the physicist Enrico Fermi, who along with Paul Dirac developed quantum statistical models of their behavior. Compare boson.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.