In particle physics, supersymmetry, SUSY, is a proposed extension of spacetime symmetry that relates two basic classes of elementary particles: bosons, which have an integer-valued spin, and fermions, which have a half-integer spin
A theory that attempts to unify the fundamental physical forces and which proposes a physical symmetry between bosons and fermions
(physics) a theory that tries to link the four fundamental forces; "according to supersymmetry each force emerged separately during the big bang