Definition -
(1) The theory and practice of creating verse.
(2) The study of the rhythm and intonation of language as determined by pitch, stress, and juncture.

Etymology -
The word derives from the Greek prosoidia, song sung to music (from the Greek pros, to + oide, song or poem).

Oxford English Dictionary -
Its first citation in sense (1) is from circa 1450:
"Amonges alle clerkys we bere the prysse, Of gramer, cadens, and of prosodye."
(Cov. Myst. xx. (Shaks. Soc.) 189)

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