Source : Webster's Revised Unabridged Dictionary (1913)

Lament \La*ment"\, v. i. [F. lamenter, L. lamentari, fr.
   lamentum a lament.]
   To express or feel sorrow; to weep or wail; to mourn.

         Jeremiah lamented for Josiah.            --2 Chron.
                                                  xxxv. 25.

         Ye shall weep and lament, but the world shall rejoice.
                                                  --John xvi.
                                                  20.

Lament \La*ment"\, v. t. [imp. & p. p. {Lamented}; p. pr. & vb.
   n. {Lamenting}.]
   To mourn for; to bemoan; to bewail.

         One laughed at follies, one lamented crimes. --Dryden.

   Syn: To deplore; mourn; bewail. See {Deplore}.

Lament \La*ment"\, n. [L. lamentum. Cf. {Lament}, v.]
   1. Grief or sorrow expressed in complaints or cries;
      lamentation; a wailing; a moaning; a weeping.

            Torment, and loud lament, and furious rage.
                                                  --Milton.

   2. An elegy or mournful ballad, or the like.

Source : WordNet®

lament
     n 1: a cry of sorrow and grief; "their pitiful laments could be
          heard throughout the ward" [syn: {lamentation}, {plaint},
           {wail}]
     2: a song or hymn of mourning composed or performed as a
        memorial to a dead person [syn: {dirge}, {coronach}, {requiem},
         {threnody}]
     3: a mournful poem; a lament for the dead [syn: {elegy}]
     v 1: express grief verbally; "we lamented the death of the child"
          [syn: {keen}]
     2: regret strongly; "I deplore this hostile action"; "we
        lamented the loss of benefits" [syn: {deplore}, {bewail},
        {bemoan}]