mid-15c., back-formation from lamentation or else from Old French lamenter "to moan, bewail" (14c.) and directly from Latin lamentari "to wail, moan, weep, lament," from lamentum "a wailing, moaning, weeping." Related: Lamented; lamenting.
1590s, "expression of sorrow or grief," from Middle French lament and directly from Latin lamentum "a wailing, moaning, weeping" (see lamentation). From 1690s as "a mourning song."
their pitiful laments could be heard throughout the ward
we lamented the death of the child
we lamented the loss of benefits