Fermion Definition
 fûrmē-ŏn, fĕr- 
  fermions
  
    noun
  
 Any of a class of subatomic particles that obey the Pauli exclusion principle and have fractional spin, including the leptons, quarks, and baryons.
 Webster's New World 
Other Word Forms of Fermion
Noun
Singular:
 fermionPlural:
 fermionsOrigin of Fermion
- From Enrico Fermi (Italian-American physicist) + -on. - From Wiktionary 
- After Enrico Fermi - From American Heritage Dictionary of the English Language, 5th Edition 
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