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 (fûr′mē-ŏn′, fĕr′-)
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.]


(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]


(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.
[1945–50; fermi + (mes) on]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
subatomic particle, particle - a body having finite mass and internal structure but negligible dimensions
References in periodicals archive ?
Further coupled with supersymmetry, which proposes a correspondence between half-integer spin particles called "fermions" and integer spin particles called "bosons," string theory proposes to solve several theoretical problems.
He explains the action approach, including its relation to Maxwell's equation and Dirac fields, then examines continuous symmetries and conservation laws, magnetostatics, multivalued fields in superfluids and superconductors, magnetic monopoles, electric charge confinement, multivalued mapping from ideal crystals to crystals with defects, defect melting, relativistic mechanics in curvilinear coordinates, torsion and curvature from defects and embedding, mutivalued mapping, field equations of gravitation, fields of integer spin, particles with half-integer spins, covariant conservation gravitation of spinning matter as a gauge theory, evanescent properties of torsion in gravity, the teleparallel theory of gravitation embedding, and emerging gravity.