Real Dictionary

gradus in American English
a dictionary of prosody for help in writing Greek or Latin poetry

gradus in American English 1
noun: a work consisting wholly or in part of exercises of increasing difficulty

gradus in American English 2
noun: 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

gradus in British English
noun: a book of études or other musical exercises arranged in order of increasing difficulty