Source : Webster's Revised Unabridged Dictionary (1913)

Alien \Al"ien\, v. t. [F. ali['e]ner, L. alienare.]
   To alienate; to estrange; to transfer, as property or
   ownership. [R.] ``It the son alien lands.'' --Sir M. Hale.

         The prince was totally aliened from all thoughts of . .
         . the marriage.                          --Clarendon.

Alien \Al"ien\, a. [OF. alien, L. alienus, fr. alius another;
   properly, therefore, belonging to another. See {Else}.]
   1. Not belonging to the same country, land, or government, or
      to the citizens or subjects thereof; foreign; as, alien
      subjects, enemies, property, shores.

   2. Wholly different in nature; foreign; adverse; inconsistent
      (with); incongruous; -- followed by from or sometimes by
      to; as, principles alien from our religion.

            An alien sound of melancholy.         --Wordsworth.

   {Alien enemy} (Law), one who owes allegiance to a government
      at war with ours. --Abbott.

Alien \Al"ien\, n.
   1. A foreigner; one owing allegiance, or belonging, to
      another country; a foreign-born resident of a country in
      which he does not possess the privileges of a citizen.
      Hence, a stranger. See {Alienage}.

   2. One excluded from certain privileges; one alienated or
      estranged; as, aliens from God's mercies.

            Aliens from the common wealth of Israel. --Ephes.
                                                  ii. 12.

Source : WordNet®

alien
     adj 1: not contained in or deriving from the essential nature of
            something; "an economic theory alien to the spirit of
            capitalism"; "the mysticism so foreign to the French
            mind and temper"; "jealousy is foreign to her nature"
            [syn: {foreign}]
     2: being or from or characteristic of another place or part of
        the world; "alien customs"; "exotic plants in a
        greenhouse"; "exotic cuisine" [syn: {exotic}]

alien
     n 1: a person who comes from a foreign country; someone who does
          not owe allegiance to your country [syn: {foreigner}, {noncitizen},
           {outlander}] [ant: {citizen}]
     2: anyone who does not belong in the environment in which they
        are found [syn: {stranger}, {unknown}]
     3: a form of life assumed to exist outside the Earth or its
        atmosphere [syn: {extraterrestrial being}, {extraterrestrial}]
     v 1: transfer property or ownership; "The will aliened the
          property to the heirs" [syn: {alienate}]
     2: arouse hostility or indifference in where there had formerly
        been love, affection, or friendliness [syn: {estrange}, {alienate},
         {disaffect}]