Plaint /(?)/

Plaint

n.
  1. Audible expression of sorrow; lamentation; complaint; hence, a mournful song; a lament.
  2. An accusation or protest on account of an injury.
    There are three just grounds of war with Spain: one of plaint, two upon defense.
  3. A private memorial tendered to a court, in which a person sets forth his cause of action; the exhibiting of an action in writing. (Law)