What is the meaning of lament?

noun

• A cry of sorrow and grief.
  • usage: "their pitiful laments could be heard throughout the ward"
  • synonyms: lamentation, plaint, wail
• A song or hymn of mourning composed or performed as a memorial to a dead person.
  • synonyms: dirge, coronach, requiem, threnody
• A mournful poem; a lament for the dead.
  • synonyms: elegy

verb

• Express grief verbally.
  • usage: "we lamented the death of the child"
  • synonyms: keen
• Regret strongly.
  • usage: "I deplore this hostile action"; "we lamented the loss of benefits"
  • synonyms: deplore, bewail, bemoan