noun (n)

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

  Synonym:
  depreciation, derogation
  

  source: wordnet30
• the act of speaking contemptuously of(noun.act)

  Synonym:
  dispraise
  

  source: wordnet30
• Matching any one in marriage under his or her degree; injurious union with something of inferior excellence; a lowering in rank or estimation.(noun)

  source: webster1913