The Collaborative International Dictionary of English v.0.48:

Liberation \Lib`er*a"tion\ (l[i^]b`[~e]r*[=a]"sh[u^]n), n. [L.
   liberatio: cf. F. lib['e]ration. Cf. Livraison.]
   The act of liberating or the state of being liberated.
   [1913 Webster]

         This mode of analysis requires perfect liberation from
         all prejudged system.                    --Pownall.
   [1913 Webster]

WordNet (r) 3.0 (2006):

liberation
    n 1: the act of liberating someone or something [syn:
         liberation, release, freeing]
    2: the attempt to achieve equal rights or status; "she worked
       for women's liberation"
    3: the termination of someone's employment (leaving them free to
       depart) [syn: dismissal, dismission, discharge,
       firing, liberation, release, sack, sacking]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "liberation":
   abstraction, annexation, appropriation, boosting, break, breakout,
   broad-mindedness, conversion, conveyance, deliverance, delivery,
   emancipation, embezzlement, emergence, enfranchisement,
   enfranchising, escape, escapism, evasion, extrication, filching,
   flight, fraud, free thought, freeing, freethinking, getaway, graft,
   issuance, issue, jailbreak, latitudinarianism, leak, leakage,
   liberalism, libertarianism, libertinism, lifesaving, lifting,
   loosing, open-mindedness, outlet, pilferage, pilfering, pinching,
   poaching, prisonbreak, ransom, recovery, redemption, release,
   releasing, rescue, rescuing, retrieval, riddance, salvage,
   salvation, saving, scrounging, setting-free, shoplifting,
   snatching, sneak thievery, snitching, stealage, stealing, swindle,
   swiping, theft, thievery, thieving, tolerance, toleration,
   unbigotedness, unchaining, unfettering, unshackling, vent



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

LIBERATION, civil law. This term is synonymous with payment. Dig. 50, 16,
47. It is the extinguishment of a contract by which he who was bound
become's free, or liberated. Wolff, Dr. de la Nat. Sec. 749.