The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   2. Wholly different in nature; foreign; adverse; inconsistent
      (with); incongruous; -- followed by from or sometimes by
      to; as, principles alien from our religion.
      [1913 Webster]

            An alien sound of melancholy.         --Wordsworth.
      [1913 Webster]

   Alien enemy (Law), one who owes allegiance to a government
      at war with ours. --Abbott.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   2. One excluded from certain privileges; one alienated or
      estranged; as, aliens from God's mercies.
      [1913 Webster]

            Aliens from the common wealth of Israel. --Ephes.
                                                  ii. 12.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

         The prince was totally aliened from all thoughts of . .
         . the marriage.                          --Clarendon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

207 Moby Thesaurus words for "alien":
   Jim Crow, Martian, Uitlander, abalienate, adversary, adversative,
   adverse, alienate, alter, antagonistic, anti, antipathetic,
   antithetic, apart, apartheid, assign, astronaut, auslander,
   barbarian, barbaric, barbarous, case, cede, change, character,
   clashing, color bar, competitive, con, conflicting, contradictory,
   contrary, convert, convey, cosmonaut, counter, crackpot, crank,
   cross, deed, deracine, detached, disaccordant, disaffect,
   disconnected, discrete, disjunct, displaced person, disrelated,
   dissentient, dissociated, disunify, disunite, division, eccentric,
   emigre, enemy, ethnocentrism, exclusiveness, exile, exotic,
   exterior, external, exterrestrial, exterritorial, extragalactic,
   extralateral, extraliminal, extramundane, extramural, extraneous,
   extrapolar, extraprovincial, extrasolar, extraterrene,
   extraterrestrial, extraterritorial, extratribal, extrinsic,
   fanatic, foreign, foreign devil, foreign-born, foreigner,
   fractious, give up, gringo, hand over, hermit, hobo, hostile,
   immigrant, incommensurable, incomparable, incompatible,
   incongruous, inconsonant, independent, inimical, insular,
   insularity, insulation, intrusive, irrelative, isolated, isolation,
   know-nothingism, kook, lone wolf, loner, make over, man from Mars,
   maverick, meshuggenah, narrowness, natural, negative, newcomer,
   nonconformist, noncooperative, nut, obstinate, odd fellow, oddball,
   oddity, opponent, opposed, opposing, opposite, oppositional,
   oppositive, oppugnant, original, other, otherworldly, out-group,
   outcast, outland, outlander, outlandish, outlaw, outside, outsider,
   overthwart, pariah, parochialism, persona non grata, perverse,
   planetary colony, quarantine, queer duck, queer fish,
   queer specimen, race hatred, racial segregation, rara avis,
   recalcitrant, refractory, refugee, relinquish, remise, removed,
   repugnant, rival, rocket man, rocketeer, screwball, seclusion,
   segregate, segregation, separate, separated, separation, sign over,
   snobbishness, solitary, space, space crew, space traveler,
   spaceman, strange, stranger, the Wandering Jew, tightness,
   tramontane, tramp, transcendental, transmundane, type, ulterior,
   ultramontane, unaffiliated, unallied, unassociated, unconnected,
   uncooperative, unearthly, unfamiliar, unfavorable, unfriendly,
   unpropitious, unrelatable, unrelated, wanderer, wean, xenophobia,
   zealot



Easton's 1897 Bible Dictionary:

Alien
   a foreigner, or person born in another country, and therefore
   not entitled to the rights and privileges of the country where
   he resides. Among the Hebrews there were two classes of aliens.

     (1.) Those who were strangers generally, and who owned no
   landed property.

     (2.) Strangers dwelling in another country without being
   naturalized (Lev. 22:10; Ps. 39:12).

     Both of these classes were to enjoy, under certain conditions,
   the same rights as other citizens (Lev. 19:33, 34; Deut. 10:19).
   They might be naturalized and permitted to enter into the
   congregation of the Lord by submitting to circumcision and
   abandoning idolatry (Deut. 23:3-8).

     This term is used (Eph. 2:12) to denote persons who have no
   interest in Christ.


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

ALIEN, persons. One born out of the jurisdiction of the United States, who
has not since been naturalized under their constitution and laws. To this
there are some exceptions, as this children of the ministers of the United
States in foreign courts. See Citizen, Inhabitant.
     2. Aliens are subject to disabilities, have rights, and are bound to
perform duties, which will be briefly considered. 1. Disabilities. An alien
cannot in general acquire title to real estate by the descent, or by other
mere operation of law; and if he purchase land, he may be divested of the
fee, upon an inquest of office found. To this general rule there are
statutory exceptions in some of the states; in Pennsylvania, Ohio,
Louisiana, New Jersey, Rev. Laws, 604, and Michigan, Rev. St. 266, s. 26,
the disability has been removed; in North Carolina, (but see Mart. R. 48; 3
Dev. R. 138; 2 Hayw. 104, 108; 3 Murph. 194; 4 Dev. 247; Vermont and
Virginia, by constitutional provision; and in Alabama, 3 Stew R. 60;
Connecticut, act of 1824, Stat. tit. Foreigners, 251; Indiana, Rev. Code, a.
3, act of January 25, 1842; Illinois, Kentucky, 1 Litt. 399; 6 Mont. 266
Maine, Rev. St,. tit. 7, c. 93, s. 5 Maryland, act of 1825, ch. 66; 2 Wheat.
259; and Missouri, Rev. Code, 1825, p. 66, by statutory provision it is
partly so.
     3. An alien, even after being naturalized, is ineligible to the office
of president of the United States; and in some states, as in New York, to
that of governor; he cannot be a member of congress, till the expiration of
seven years after his naturalization. An alien can exercise no political
rights whatever; he cannot therefore vote at any political election, fill
any office, or serve as a juror. 6 John. R. 332.
     4.-2. An alien has a right to acquire personal estate, make and
enforce contracts in relation to the same - he is protected from injuries,
and wrongs, to his person and property, his relative rights and character;
he may sue and be sued.
     5.-3. He owes a temporary local allegiance, and his property is
liable to taxation. Aliens are either alien friends or alien enemies. It is
only alien friends who have the rights above enumerated; alien enemies are
incapable, during the existence of war to sue, and may be ordered out of the
country. See generally, 2 Kent. Com. 43 to 63; 1 Vin. Ab. 157; 13 Vin. ab.
414; Bac. Ab. h.t.; 1 Saund. 8, n.2; Wheat. Dig. h.t.; Bouv. Inst. Index,
h.t.



The Devil's Dictionary (1881-1906):

ALIEN, n.  An American sovereign in his probationary state.