lamento
/laˈmento/ · A2 · noun · m
lament
lamento = English lament + o, from Latin lamentum (a wailing)
Same Latin root as English lament and lamentation, so the meaning carries over directly. Stress the middle syllable: la-MEN-to. It is also the yo form of lamentar: lo lamento = I am sorry, literally I lament it.