What is the meaning of Fermion?

Any elementary or composite particle that has half-integer spin and thus obeys Fermi–Dirac statistics and the Pauli exclusion principle (equivalently, a particle for which the wavefunction of any system of identical such particles changes sign whenever two are swapped); a baryon, a lepton or a quark;
any such particle or any composite particle composed of fermions.

fermion

accusative singular of fermio

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Source: wiktionary.org