noun (n)

• a song or hymn of mourning composed or performed as a memorial to a dead person(noun.communication)

  Synonym:
  coronach, dirge, lament, threnody
  

  source: wordnet30
• a musical setting for a Mass celebrating the dead(noun.communication)

  source: wordnet30
• a Mass celebrated for the dead(noun.act)

  source: wordnet30
• A mass said or sung for the repose of a departed soul.(noun)

  source: webster1913