The Collaborative International Dictionary of English v.0.48:

Original \O*rig"i*nal\, a. [F. original, L. originalis.]
   [1913 Webster]
   1. Pertaining to the origin or beginning; preceding all
      others; first in order; primitive; primary; pristine; as,
      the original state of man; the original laws of a country;
      the original inventor of a process.
      [1913 Webster]

            His form had yet not lost
            All her original brightness.          --Milton.
      [1913 Webster]

   2. Not copied, imitated, or translated; new; fresh; genuine;
      as, an original thought; an original process; the original
      text of Scripture.
      [1913 Webster]

   3. Having the power to suggest new thoughts or combinations
      of thought; inventive; as, an original genius.
      [1913 Webster]

   4. Before unused or unknown; new; as, a book full of original
      matter.
      [1913 Webster]

   Original sin (Theol.), the first sin of Adam, as related to
      its consequences to his descendants of the human race; --
      called also total depravity. See Calvinism.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Total \To"tal\, a. [F., fr. LL. totalis, fr. L. tolus all,whole.
   Cf. Factotum, Surtout, Teetotum.]
   Whole; not divided; entire; full; complete; absolute; as, a
   total departure from the evidence; a total loss. " Total
   darkness." "To undergo myself the total crime." --Milton.
   [1913 Webster]

   Total abstinence. See Abstinence, n., 1.

   Total depravity. (Theol.) See Original sin, under
      Original.
      [1913 Webster]

   Syn: Whole; entire; complete. See Whole.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Depravity \De*prav"i*ty\, n. [From Deprave: cf. L. pravitas
   crookedness, perverseness.]
   The state of being depraved or corrupted; a vitiated state of
   moral character; general badness of character; wickedness of
   mind or heart; absence of religious feeling and principle.
   [1913 Webster]

   Total depravity. See Original sin, and Calvinism.

   Syn: Corruption; vitiation; wickedness; vice; contamination;
        degeneracy.

   Usage: Depravity, Depravation, Corruption. Depravilty
          is a vitiated state of mind or feeling; as, the
          depravity of the human heart; depravity of public
          morals. Depravation points to the act or process of
          making depraved, and hence to the end thus reached;
          as, a gradual depravation of principle; a depravation
          of manners, of the heart, etc. Corruption is the only
          one of these words which applies to physical
          substances, and in reference to these denotes the
          process by which their component parts are dissolved.
          Hence, when figuratively used, it denotes an utter
          vitiation of principle or feeling. Depravity applies
          only to the mind and heart: we can speak of a depraved
          taste, or a corrupt taste; in the first we introduce
          the notion that there has been the influence of bad
          training to pervert; in the second, that there is a
          want of true principle to pervert; in the second, that
          there is a want of true principles to decide. The
          other two words have a wider use: we can speak of the
          depravation or the corruption of taste and public
          sentiment. Depravity is more or less open; corruption
          is more or less disguised in its operations. What is
          depraved requires to be reformed; what is corrupt
          requires to be purified.
          [1913 Webster]

WordNet (r) 3.0 (2006):

total depravity
    n 1: the Calvinist doctrine that everyone is born in a state of
         corruption as a result of original sin