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arsis and thesis
prosody
arsis and thesis, in prosody, respectively, the accented and unaccented parts of a poetic foot. Arsis, a term of Greek origin meaning “the act of raising or lifting” or “raising the foot in beating time,” refers in Greek, or quantitative, verse to the lighter or shorter part of a poetic foot, and thesis to the accented part of the poetic foot. In Latin, or accentual, verse, the meanings of these words were reversed—arsis came to mean the accented or longer part of the foot, and thesis the unaccented part. It is the Latin meaning that has been retained in modern usage.