[1] : The Collaborative International Dictionary of English v.0.48

immigrant \im"migrant\, n. l. immigrans, p. pr. of immigrare
   to go into: cf. f. immigrant. see immigrate.
   one who immigrates; one who comes to a country for the
   purpose of permanent residence; -- correlative of emigrant.

   syn: see emigrant.
        1913 webster
see also:
immigrate emigrant 

[2] : WordNet (r) 2.0

immigrant
     n : a person who comes to a country where they were not born in
         order to settle there

[3] : Moby Thesaurus II by Grady Ward, 1.0

62 moby thesaurus words for "immigrant":
   dp, alien, arrival, arriviste, citizen, citizen by adoption,
   colonial, colonist, colonizer, comer, cosmopolitan, cosmopolite,
   displaced person, emigrant, emigre, entrant, evacue, evacuee,
   exile, expatriate, foreigner, gate-crasher, greenhorn, homesteader,
   hyphenate, hyphenated american, in-migrant, incomer, intruder,
   metic, migrant, migrator, migratory worker, national,
   naturalized citizen, nester, new arrival, new boy, newcomer,
   nonnative citizen, novus homo, out-migrant, outlander, outsider,
   parvenu, pioneer, planter, precursor, recruit, rookie, settler,
   sooner, squatter, stateless person, stowaway, subject, tenderfoot,
   trekker, upstart, visitant, visitor, wetback

[4] : THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993)

immigrant, n.  an unenlightened person who thinks one country better
than another.

Immigrant >> I Words
Immigrant, definition of term: Immigrant
immigrant_pag1.html