perficient /pə(ɹ)ˈfɪʃənt/noun 2adjective 1forms 3 noun2 •One who performs or perfects a work. •One who endows a charity. adjective1 •Making or doing thoroughly; efficient; effectual.And , in general , the king being the sole founder of all civil corporations , and the endower the perficient founder of all eleemosynary ones — 1765 formsperficients · more perficient · most perficient