/lam'euhn tay"sheuhn/ , n.
1. the act of lamenting or expressing grief.
2. a lament.
3. Lamentations , ( used with a sing. v. ) a book of the Bible, traditionally ascribed to Jeremiah. Abbr.: Lam.
[ 1325-75; lamentation- (s. of lamentatio ), equiv. to lamentat ( us ) (ptp. of lamentari; see LAMENT) + -ion- -ION; r. ME lamentacioun ]