gradus 1
/gray"deuhs/ , n. , pl. graduses . Music.
a work consisting wholly or in part of exercises of increasing difficulty.
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gradus 2
/gray"deuhs/ , n. , pl. graduses .
a dictionary of prosody, esp. one that gives word quantities and poetic phrases and that is intended to aid students in the writing of Latin and Greek verse.
[ 1755-65; after Gradus ad Parnassum (a step to Parnassus), Latin title of a dictionary of prosody much used in English public schools during the 18th and 19th centuries ]