The Collaborative International Dictionary of English v.0.48:

Alienation \Al`ien*a"tion\, n. [F. ali['e]nation, L. alienatio,
   fr. alienare, fr. alienare. See Alienate.]
   1. The act of alienating, or the state of being alienated.
      [1913 Webster]

   2. (Law) A transfer of title, or a legal conveyance of
      property to another.
      [1913 Webster]

   3. A withdrawing or estrangement, as of the affections.
      [1913 Webster]

            The alienation of his heart from the king. --Bacon.
      [1913 Webster]

   4. Mental alienation; derangement of the mental faculties;
      insanity; as, alienation of mind.
      [1913 Webster]

   Syn: Insanity; lunacy; madness; derangement; aberration;
        mania; delirium; frenzy; dementia; monomania. See
        Insanity.
        [1913 Webster]

WordNet (r) 3.0 (2006):

alienation
    n 1: the feeling of being alienated from other people [syn:
         alienation, disaffection, estrangement]
    2: separation resulting from hostility [syn: alienation,
       estrangement]
    3: (law) the voluntary and absolute transfer of title and
       possession of real property from one person to another; "the
       power of alienation is an essential ingredient of ownership"
    4: the action of alienating; the action of causing to become
       unfriendly; "his behavior alienated the other students"

Moby Thesaurus II by Grady Ward, 1.0:

247 Moby Thesaurus words for "alienation":
   abalienation, aberration, abnormality, abstraction, abulia,
   agreement to disagree, aloneness, aloofness, amortization,
   amortizement, anxiety, anxiety equivalent, anxiety state, apathy,
   apostasy, assignation, assignment, autism, autistic thinking,
   avoidance mechanism, bargain and sale, barter, bequeathal,
   blame-shifting, brain damage, brainsickness, brainwashing, breach,
   breach of friendship, break, catatonic stupor, celibacy, cession,
   cleavage, cleft, clouded mind, compensation, compulsion,
   conferment, conferral, consignation, consignment, conveyance,
   conveyancing, corruption, counter-culture, counterindoctrination,
   craziness, daftness, decompensation, deeding, defense mechanism,
   dejection, deliverance, delivery, dementedness, dementia, demise,
   depression, derangement, dereism, dereistic thinking, detachment,
   difference, disaccord, disaffection, disagreement, disapprobation,
   disapproval, disarticulation, disassociation, disconnectedness,
   disconnection, discontinuity, disengagement, disfavor, disjointing,
   disjunction, dislocation, disorientation, disparity, displacement,
   disposal, disposition, disruption, dissatisfaction, dissension,
   dissent, dissentience, dissidence, dissociation, distraction,
   disunion, disunity, divergence, diversity, dividedness, division,
   divorce, divorcement, dropping out, elation, emotional insulation,
   emotionalism, enfeoffment, escape, escape into fantasy,
   escape mechanism, escapism, estrangement, euphoria, exchange,
   falling-out, fantasizing, fantasy, flight, folie, folie du doute,
   furor, giving, hypochondria, hysteria, hysterics, incoherence,
   indifference, indoctrination, insaneness, insanity, insensibility,
   irrationality, isolation, keeping apart, lease and release,
   lethargy, loneliness, loneness, lonesomeness, loss of mind,
   loss of reason, lunacy, luxation, madness, mania, melancholia,
   mental deficiency, mental derangement, mental disease,
   mental disorder, mental distress, mental disturbance,
   mental illness, mental instability, mental sickness,
   mind overthrown, mindsickness, minority opinion, moving apart,
   negativism, nonagreement, nonassent, nonconcurrence, nonconformity,
   nonconsent, obsession, oddness, open rupture, opposition,
   overcompensation, parting, partition, pathological indecisiveness,
   pixilation, possession, preoccupation, privacy, projection,
   psychalgia, psychomotor disturbance, psychopathy, psychotaxis,
   queerness, rabidness, rationalization, reasonlessness,
   recall of ambassadors, recusance, recusancy, reindoctrination,
   rejection, removal, repudiation, resistance, rift,
   ruffled feelings, rupture, sale, schism, secession, seclusion,
   segmentation, senselessness, separateness, separation, separatism,
   sequestration, settlement, settling, shattered mind, sick mind,
   sickness, single blessedness, sociological adjustive reactions,
   solitariness, solitude, splendid isolation, split,
   strained relations, strangeness, stupor, subdivision, sublimation,
   substitution, subtraction, subversion, surrender, tic, trading,
   transfer, transference, transmission, transmittal, twitching,
   unbalance, unbalanced mind, underground, unresponsiveness,
   unsaneness, unsound mind, unsoundness, unsoundness of mind,
   variance, vesting, wish-fulfillment fantasy, wishful thinking,
   withdrawal, witlessness, zoning



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

ALIENATION, med. jur. The term alienation or mental alienation is a generic
expression to express the different kinds of aberrations of the human
understanding. Dict. des Science Med. h.t.; 1 Beck's Med. Jur. 535.



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

ALIENATION, estates. Alienation is an act whereby one man transfers the
property and possession of lands, tenements, or other things, to another. It
is commonly applied to lands or tenements, as to alien (that is, to convey)
land in fee, in mortmain. Termes de la ley. See Co. Litt. 118 b; Cruise Dig.
tit. 32, c. 1, Sec. 1-8.
     2. Alienations may be made by deed; by matter of record; and by devise.
     3. Alienations by deed may be made by original or primary conveyances,
which are those by means of which the benefit or estate is created or first
arises; by derivative or secondary conveyances, by which the benefit or
estate originally created, is enlarged, restrained, transferred, or
extinguished. These are conveyances by the common law. To these may be added
some conveyances which derive their force and operation from the statute of
uses. The original conveyances are the following: 1. Feoffment; 2. Gift; 3.
Grant; 4. Lease; 6. Exchange; 6. Partition. The derivative are, 7. Release;
8. Confirmation; 9. Surrender; 10. Assignment; 11. Defeasance. Those
deriving their force from the statute of uses, are, 12. Covenants to stand
seised to uses; 13. Bargains and sales; 14. Lease and release; 15. Deeds to
lend or declare the uses of other more direct conveyances; 16. Deeds of
revocation of uses. 2 Bl. Com. ch. 20. Vide Conveyance; Deed. Alienations by
matter of record may be, 1. By private acts of the legislature; 2. By
grants, as by patents of lands; 3. By fines; 4. By common recovery.
Alienations may also be made by devise (q.v.)