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

fermion

fermion.

fermion

fermion

Source: wiktionary.org