noun. A dictionary of prosody designed as an aid in writing Greek or Latin verses.

noun. In music, a work consisting wholly or in great part of exercises of gradually increasing difficulty.

noun. A dictionary of prosody, designed as an aid in writing Greek or Latin poetry.

noun. A handbook used as an aid in a difficult art or practice, specifically, a dictionary of Greek or Latin prosody used as a guide in writing of poetry in Greek or Latin.

"In fact, to tell the truth, it was my cribbing book, and I always kept it by me when I was writing at Athens, like a gradus, a _gradus ad"

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