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A plaint is an archaic term for a lamentation. In law, a plaint refers to an accusation, and is the root of words such as 'complaint'. It can also refer to a poem or song of sadness, such as 'The Plaint' from Henry Purcell's opera The Fairy-Queen.
- "Definition of PLAINT". www.merriam-webster.com. Retrieved 10 February 2017.