preemption(the displacement of a lower jurisdiction's laws when they conflict with those of a higher jurisdiction) noun [UK: ˌpri.ˈemp.ʃən] [US: ˌpri.ˈemp.ʃən]
primacy(the state or condition of being prime or first) noun [UK: ˈpraɪ.mə.si] [US: ˈpraɪ.mə.si]