lamentationPronunciation: /lamənˈteɪʃ(ə)n/Definition of lamentation noun [mass noun] the passionate expression of grief or sorrow; weeping:scenes of lamentation (Lamentations or Lamentations of Jeremiah) a book of the Bible telling of the desolation of Judah after the fall of Jerusalem in 586 bc. lamentation in other Oxford dictionaries Definition of lamentation in the US English dictionary