süsteem libisemistasandi(te)st ja -suun(d)a(de)st, millistel toimub plastseid deformatioone esile kutsuv dislokatsioonide libisemine (vt libisemine kristallis, libisemistasand, libisemissuund), a set of symmetrically identical slip planes and associated family of slip directions for which dislocation motion can easily occur and lead to plastic deformation (see: slip, slip plane, slip direction)