The Collaborative International Dictionary of English v.0.48:

Salvation \Sal*va"tion\, n. [OE. salvacioun, sauvacion, F.
   salvation, fr. L. salvatio, fr. salvare to save. See Save.]
   1. The act of saving; preservation or deliverance from
      destruction, danger, or great calamity.
      [1913 Webster]

   2. (Theol.) The redemption of man from the bondage of sin and
      liability to eternal death, and the conferring on him of
      everlasting happiness.
      [1913 Webster]

            To earn salvation for the sons of men. --Milton.
      [1913 Webster]

            Godly sorrow worketh repentance to salvation. --2.
                                                  Cor. vii. 10.
      [1913 Webster]

   3. Saving power; that which saves.
      [1913 Webster]

            Fear ye not; stand still, and see the salvation of
            the Lord, which he will show to you to-day. --Ex.
                                                  xiv. 13.
      [1913 Webster]

   Salvation Army, an organization for prosecuting the work of
      Christian evangelization, especially among the degraded
      populations of cities. It is virtually a new sect founded
      in London in 1861 by William Booth. The evangelists, male
      and female, have military titles according to rank, that
      of the chief being "General." They wear a uniform, and in
      their phraseology and mode of work adopt a quasi military
      style.
      [1913 Webster]

WordNet (r) 3.0 (2006):

salvation
    n 1: (theology) the act of delivering from sin or saving from
         evil [syn: redemption, salvation]
    2: a means of preserving from harm or unpleasantness; "tourism
       was their economic salvation"; "they turned to individualism
       as their salvation"
    3: the state of being saved or preserved from harm
    4: saving someone or something from harm or from an unpleasant
       situation; "the salvation of his party was the president's
       major concern"

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "salvation":
   adoption, circumcision, conservancy, conservation, conservationism,
   conversion, deliverance, delivery, environmental conservation,
   extrication, forest conservation, forest management, freeing,
   keeping, liberation, lifesaving, maintenance, new birth, new life,
   preserval, preservation, protection, ransom, rebirth, reclamation,
   recovery, redeemedness, redemption, reformation, regeneration,
   release, rescue, retrieval, safekeeping, salvage, saving,
   second birth, soil conservation, spiritual purification,
   stream conservation, support, sustentation, upkeep,
   water conservation, wetlands conservation, wildlife conservation



Easton's 1897 Bible Dictionary:

Salvation
   This word is used of the deliverance of the Israelites from the
   Egyptians (Ex. 14:13), and of deliverance generally from evil or
   danger. In the New Testament it is specially used with reference
   to the great deliverance from the guilt and the pollution of sin
   wrought out by Jesus Christ, "the great salvation" (Heb. 2:3).
   (See REDEMPTION; REGENERATION.)