Source : Webster's Revised Unabridged Dictionary (1913)

Fief \Fief\, n. [F. fief; of German origin, and the same word as
   E. fee. See {Fee}, and cf. {Feud}, a tief.] (Law)
   An estate held of a superior on condition of military
   service; a fee; a feud. See under {Benefice}, n., 2.

Source : WordNet®

fief
     n : a piece of land held under the feudal system [syn: {feoff}]