Source : Webster's Revised Unabridged Dictionary (1913)

Perficient \Per*fi"cient\, n.
   One who performs or perfects a work; especially, one who
   endows a charity. [R.]

Perficient \Per*fi"cient\, a. [L. perficiens, p. pr. of
   perficere to perform. See {Perfect}.]
   Making or doing throughly; efficient; effectual. [R.]
   --Blackstone.