The Collaborative International Dictionary of English v.0.48:

Thraldom \Thral"dom\, n. [Icel. ?r[ae]ld[=o]mr. See Thrall,
   and -dom.]
   The condition of a thrall; slavery; bondage; state of
   servitude. [Written also thralldom.]
   [1913 Webster]

         Women are born to thraldom and penance
         And to be under man's governance.        --Chaucer.
   [1913 Webster]

         He shall rule, and she in thraldom live. --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

thraldom
    n 1: the state of being under the control of another person
         [syn: bondage, slavery, thrall, thralldom,
         thraldom]