What does the word plaint mean?

Usage examples for plaint

  1. So closely did they keep time and so smoothly did one bunch take up where another left off that we, standing less than twenty feet away, could not tell which group was singing except when the Tuba City crowd took up the plaint. – I Married a Ranger by Dama Margaret Smith
  2. The poor woman had begun her plaint in a manner that was not altogether devoid of a discreet eloquence. – Orley Farm by Anthony Trollope