# fermion

(redirected from*Half-integer spin*)

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## fer·mi·on

(fûr′mē-ŏn′, fĕr′-)*n.*

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**.]## fermion

(ˈfɜːmɪˌɒn)*n*

(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]

## fer•mi•on

(ˈfɜr miˌɒn, ˈfɛər-)*n.*

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.

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Noun | 1. | fermion - any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principlebaryon, 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 |

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