gradus

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gradus

(ˈɡreɪdəs)
n, pl -duses
1. (Classical Music) a book of études or other musical exercises arranged in order of increasing difficulty
2. (Poetry) prosody a dictionary or textbook of prosody for use in writing Latin or Greek verse
[C18: shortened from Latin Gradus ad Parnassum a step towards Parnassus, a dictionary of prosody used in the 18th and 19th centuries]