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Any of a class of particles having a spin that is half an odd integer and obeying the exclusion principle, by which no more than one identical particle may occupy the same quantum state. The fermions include the baryons, quarks, and leptons.
[After Enrico Fermi.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Nuclear Physics) any of a group of elementary particles, such as a nucleon, that has half-integral spin and obeys Fermi-Dirac statistics. Compare boson
[C20: named after Enrico Fermi; see -on]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
fer•mi•on(ˈfɜr miˌɒn, ˈfɛər-)
any elementary particle, as a neutron, proton, or electron, that is subject to the exclusion principle and whose spin is half an odd integer: ½, 3/2, etc.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||fermion - any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle|
baryon, heavy particle - any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1
lepton - an elementary particle that participates in weak interactions; has a baryon number of 0
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