The Collaborative International Dictionary of English v.0.48:

feudal \feu"dal\ (f[=u]"dal), a. [F. f['e]odal, or LL.
   feudalis.]
   1. Of or pertaining to feuds, fiefs, or fees; as, feudal
      rights or services; feudal tenures.
      [1913 Webster]

   2. Consisting of, or founded upon, feuds or fiefs; embracing
      tenures by military services; as, the feudal system.
      [1913 Webster]

WordNet (r) 3.0 (2006):

feudal
    adj 1: of or relating to or characteristic of feudalism [syn:
           feudal, feudalistic]