Source : Webster's Revised Unabridged Dictionary (1913)

Depreciation \De*pre`ci*a"tion\, n. [Cf. F. d['e]pr['e]ciation.]
   1. The act of lessening, or seeking to lessen, price, value,
      or reputation.

   2. The falling of value; reduction of worth. --Burke.

   3. the state of being depreciated.

Source : WordNet®

depreciation
     n 1: a decrease in price or value; "depreciation of the dollar
          against the yen" [ant: {appreciation}]
     2: decrease in value of an asset due to obsolescence or use
        [syn: {wear and tear}]
     3: a communication that belittles somebody or something [syn: {disparagement},
         {derogation}]