perforce

adv (arch or fml 古或文) because it is necessary or inevitable 必; 必然; 必定.

perennial, perennially, perestroika, perfect, perfect pitch (also absolute pitch), perfectibility, perfectible, perfection, perfectionism, perfectionist, perfectly, prefer sb to do sth., perfervid, perfidious, perfidiously, perfidiousness, perfidy, perforate, perforating, perforation, perform, performance, performer, performing arts, perfume, perfumed, perfumer, perfumery, perfunctorily, perfunctoriness, perfunctory, pergola, perhaps, peri-, perigee, perihelion, peril, perilous, perimeter, period,