noun (n)

• a communication that belittles somebody or something(noun.communication)

  Synonym:
  depreciation, disparagement
  

  source: wordnet30
• (law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law(noun.act)

  Example:
  Any derogation of the common law is to be strictly construed.
  

  source: wordnet30
• The act of derogating, partly repealing, or lessening in value; disparagement; detraction; depreciation; -- followed by of, from, or to.(noun)

  source: webster1913