Source : Webster's Revised Unabridged Dictionary (1913)

Vassalage \Vas"sal*age\, n. [OE. vassalage, F. vasselage, LL.
   vassallaticum.]
   1. The state of being a vassal, or feudatory.

   2. Political servitude; dependence; subjection; slavery; as,
      the Greeks were held in vassalage by the Turks.

   3. A territory held in vassalage. ``The Countship of Foix,
      with six territorial vassalages.'' --Milman.

   4. Vassals, collectively; vassalry. [R.] --Shak.

   5. Valorous service, such as that performed by a vassal;
      valor; prowess; courage. [Obs.] --Chaucer.

Source : WordNet®

vassalage
     n : the state of a serf [syn: {serfdom}, {serfhood}]