The Collaborative International Dictionary of English v.0.48:

Liege \Liege\ (l[=e]j), a. [OE. lige, lege, F. lige, LL. ligius,
   legius, liege, unlimited, complete, prob. of German origin;
   cf. G. ledig free from bonds and obstacles, MHG. ledec,
   ledic, lidic, freed, loosed, and Charta Ottonis de Benthem,
   ann. 1253, "ligius homo quod Teutonic[`e] dicitur ledigman,"
   i. e., uni soli homagio obligatus, free from all obligations
   to others; influenced by L. ligare to bind. G. ledig perh.
   orig. meant, free to go where one pleases, and is perh. akin
   to E. lead to conduct. Cf. Lead to guide.]
   1. Sovereign; independent; having authority or right to
      allegiance; as, a liege lord. --Chaucer.
      [1913 Webster]

            She looked as grand as doomsday and as grave;
            And he, he reverenced his liege lady there.
                                                  --Tennyson.
      [1913 Webster]

   2. serving an independent sovereign or master; bound by a
      feudal tenure; obliged to be faithful and loyal to a
      superior, as a vassal to his lord; faithful; loyal; as, a
      liege man; a liege subject.
      [1913 Webster]

   3. (Old Law) Full; perfect; complete; pure. --Burrill.
      [1913 Webster]

   Liege homage (Feudal Custom), that homage of one sovereign
      or prince to another which acknowledged an obligation of
      fealty and services.

   Liege poustie [L. legitima potestas] (Scots Law), perfect,
      i. e., legal, power; specif., having health requisite to
      do legal acts.

   Liege widowhood, perfect, i. e., pure, widowhood. [Obs.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Liege \Liege\ (l[=e]j), n.
   1. A free and independent person; specif., a lord paramount;
      a sovereign. --Mrs. Browning.
      [1913 Webster]

            The anointed sovereign of sighs and groans,
            Liege of all loiterers and malcontents. --Shak.
      [1913 Webster]

   2. The subject of a sovereign or lord; a liegeman.
      [1913 Webster]

            A liege lord seems to have been a lord of a free
            band; and his lieges, though serving under him, were
            privileged men, free from all other obligations,
            their name being due to their freedom, not to their
            service.                              --Skeat.
      [1913 Webster]

WordNet (r) 3.0 (2006):

liege
    adj 1: owing or owed feudal allegiance and service; "one's liege
           lord"; "a liege subject"
    n 1: a person holding a fief; a person who owes allegiance and
         service to a feudal lord [syn: vassal, liege,
         liegeman, liege subject, feudatory]
    2: a feudal lord entitled to allegiance and service [syn:
       liege, liege lord]
    3: city in eastern Belgium; largest French-speaking city in
       Belgium [syn: Liege, Luik]