The Collaborative International Dictionary of English v.0.48:

Expropriate \Ex*pro"pri*ate\, v. t. [L. ex out, from + proprius
   one's own: cf. F. exproprier.]
   To put out of one's possession; to surrender the ownership
   of; also, to deprive of possession or proprietary rights.
   --Boyle.
   [1913 Webster]

         Expropriate these [bad landlords] as the monks were
         expropriated by Act of Parliament.       --M. Arnold.
   [1913 Webster]

WordNet (r) 3.0 (2006):

expropriate
    v 1: deprive of possessions; "The Communist government
         expropriated the landowners"

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "expropriate":
   accroach, annex, arrogate, attach, collectivize, commandeer,
   communalize, communize, confiscate, cut off, disendow, disherison,
   disinherit, disown, dispossess, disseise, distrain, evict,
   foreclose, garnish, impound, impress, levy, nationalize, preempt,
   press, replevin, replevy, seize, sequester, sequestrate, socialize,
   take, take away