The Collaborative International Dictionary of English v.0.48:

Enfeoff \En*feoff"\ (?; see Feoff, 277), v. t. [imp. & p. p.
   Enfeoffed; p. pr. & vb. n. Enfeoffing.] [Pref. en- +
   feoff, fief: cf. LL. infeofare, OF. enfeffer, enfeofer.]
   1. (Law) To give a feud, or right in land, to; to invest with
      a fief or fee; to invest (any one) with a freehold estate
      by the process of feoffment. --Mozley & W.
      [1913 Webster]

   2. To give in vassalage; to make subservient. [Obs.]
      [1913 Webster]

            [The king] enfeoffed himself to popularity. --Shak.

WordNet (r) 3.0 (2006):

enfeoff
    v 1: put in possession of land in exchange for a pledge of
         service, in feudal society; "He enfeoffed his son-in-law
         with a large estate in Scotland"