All 7 Uses

lament
in
Medea, by Euripides - (translated by: E.P. Coleridge)
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ATTENDANT Why dost thou, so long my lady's own handmaid, stand here at the gate alone, loudly lamenting to thyself the piteous tale?†

lamenting = expressing grief or regret
has not the poor lady ceased yet from her lamentation?†
*

lamentation = passionate expression of grief or sorrow
the agony I have suffered, deep enough to call for these laments!†

laments = expresses grief or regret
CHORUS I heard a bitter cry of lamentation!†

lamentation = passionate expression of grief or sorrow
He ceased his sad lament, and would have raised his aged frame, but found himself held fast by the fine-spun robe as ivy that clings to the branches of the bay, and then ensued a fearful struggle.†

lament = express grief or regret
This one brief day forget thy children dear, and after that lament; for though thou wilt slay them yet they were thy darlings still, and I am a lady of sorrows.†
JASON Give up to me those dead, to bury and lament.†

Definitions:

(1) (lament)
to express grief or regret
(2) (meaning too rare to warrant focus)
Although lament typically refers to a feeling or simple vocal expression, it can refer to a vocal expression as complex as a sad song or poem. It can even refer to sad, but non-vocal music -- as when Tennessee Williams references background music in A Streetcar Named Desire.