Definition of gradus
1 : a dictionary of Greek or Latin prosody and poetical phrases used as an aid in the writing of verse in Greek or Latin
2 : a handbook (as of law phrases or forms) or exercise book to assist in the mastering or performance of a difficult art or practice
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Origin and Etymology of gradus
from Gradus ad Parnassum (Latin, literally, a step to Parnassus), a 17th century prosody dictionary long used in British schools
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