The Collaborative International Dictionary of English v.0.48:
Serfage \Serf"age\, Serfdom \Serf"dom\, n. The state or condition of a serf. [1913 Webster] SerfhoodWordNet (r) 3.0 (2006):
serfdom n 1: the state of a serf [syn: serfdom, serfhood, vassalage]