The Collaborative International Dictionary of English v.0.48:

Expatriation \Ex*pa`tri*a"tion\, n. [Cf. F. expatriation.]
   The act of banishing, or the state of banishment; especially,
   the forsaking of one's own country with a renunciation of
   allegiance.
   [1913 Webster]

         Expatriation was a heavy ransom to pay for the rights
         of their minds and souls.                --Palfrey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

expatriation
    n 1: the act of expelling a person from their native land; "men
         in exile dream of hope"; "his deportation to a penal
         colony"; "the expatriation of wealthy farmers"; "the
         sentence was one of transportation for life" [syn: exile,
         deportation, expatriation, transportation]
    2: migration from a place (especially migration from your native
       country in order to settle in another) [syn: emigration,
       out-migration, expatriation]