An elegy is a poem of serious reflection, and in English literature usually a lament for the dead. However, according to The Oxford Handbook of the Elegy, "for all of its pervasiveness ... the 'elegy' remains remarkably ill defined: sometimes used as a catch-all to denominate texts of a somber or pessimistic tone, sometimes as a marker for textual monumentalizing, and sometimes strictly as a sign of a lament for the dead". Source: Wikipedia (en)