- a dictionary of prosody for help in writing Greek or Latin poetry
- a book of piano studies, études, etc. arranged in a progressive order of difficulty
Origin of gradus; from Classical Latin Gradus (ad Parnassum), literally , a step (to Parnassus), title of a book (17th circa ) on Latin prosody
From Gradus ad Parnassum (Latin, literally, a step to Parnassus), a 17th century prosody dictionary long used in British schools.