The Collaborative International Dictionary of English v.0.48:

Lamentation \Lam`en*ta"tion\, n. [F. lamentation, L.
   lamentatio.]
   1. The act of bewailing; audible expression of sorrow;
      wailing; moaning.
      [1913 Webster]

            In Rama was there a voice heard, lamentation and
            weeping.                              --Matt. ii.
                                                  18.
      [1913 Webster]

   2. pl. (Script.) A book of the Old Testament attributed to
      the prophet Jeremiah, and taking its name from the nature
      of its contents.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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