The Collaborative International Dictionary of English v.0.48:

Emigrant \Em"i*grant\, a. [L. emigrans, -antis, p. pr. of
   emigrare to emigrate: cf. F. ['e]migrant. See Emigrate, v.
   i.]
   1. Removing from one country to another; emigrating; as, an
      emigrant company or nation.
      [1913 Webster]

   2. Pertaining to an emigrant; used for emigrants; as, an
      emigrant ship or hospital.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Emigrant \Em"i*grant\, n.
   One who emigrates, or quits one country or region to settle
   in another.

   Syn: Emigrant, Immigrant. Emigrant and emigration have
        reference to the country from which the migration is
        made; the correlative words immigrant and immigration
        have reference to the country into which the migration
        is made, the former marking the going out from a
        country, the latter the coming into it.
        [1913 Webster]

WordNet (r) 3.0 (2006):

emigrant
    n 1: someone who leaves one country to settle in another [syn:
         emigrant, emigre, emigree, outgoer]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "emigrant":
   DP, alien, arriviste, colonist, departer, displaced person, emigre,
   evacue, evacuee, exile, expatriate, fugitive, gate-crasher, goer,
   greenhorn, immigrant, in-migrant, intruder, leaver, migrant,
   migrator, migratory, migratory worker, new arrival, new boy,
   newcomer, novus homo, out-migrant, parvenu, recruit, refugee,
   rookie, settler, squatter, stateless person, stowaway, tenderfoot,
   trekker, upstart, wetback



Bouvier's Law Dictionary, Revised 6th Ed (1856):

EMIGRANT. One who quits his country for any lawful reason, with a design to
settle elsewhere, and who takes his family and property, if he has any, with
him. Vatt. b. 1, c. 19, Sec. 224.