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The Collaborative International Dictionary of English v.0.48:

Gradus \Gra"dus\, n. [From L. gradus ad Parnassum a step to Parnassus.] A dictionary of prosody, designed as an aid in writing Greek or Latin poetry. [1913 Webster] He set to work . . . without gradus or other help. --T. Hughes. [1913 Webster]
Bouvier's Law Dictionary, Revised 6th Ed (1856):

GRADUS. This is a Latin word, literally signifying a step; figuratively it is used to designate a person in the ascending or descending line, in genealogy; a degree.