vas·sal·age /-səlɪʤ/
  家臣身份;家臣發誓
  Vas·sal·age n.
  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.”
  4. Vassals, collectively; vassalry. [R.]
  5. Valorous service, such as that performed by a vassal; valor; prowess; courage. [Obs.]
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  vassalage
       n : the state of a serf [syn: serfdom, serfhood]