Source : Webster's Revised Unabridged Dictionary (1913)

Lamentation \Lam`en*ta"tion\, n. [F. lamentation, L.
   lamentatio.]
   1. The act of bewailing; audible expression of sorrow;
      wailing; moaning.

            In Rama was there a voice heard, lamentation and
            weeping.                              --Matt. ii.
                                                  18.

   2. pl. (Script.) A book of the Old Testament attributed to
      the prophet Jeremiah, and taking its name from the nature
      of its contents.

Source : WordNet®

lamentation
     n 1: a cry of sorrow and grief; "their pitiful laments could be
          heard throughout the ward" [syn: {lament}, {plaint}, {wail}]
     2: the passionate and demonstrative activity of expressing
        grief [syn: {mourning}]