ben•e•fac•tivePronunciation: (ben"u-fak'tiv), [key] Ling.
of or pertaining to a linguistic form, case, or semantic role that denotes the person or persons for whom an action is performed, as for his son
in He opened the door for his son.
a benefactive form or case.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.