quā̆drĭvĭum, ii, n. [quattuor-via].
I Lit., a place where four ways meet , a crossway , cross-road : in quadriviis et angiportis, Cat. 58, 4; so Juv. 1, 63: DII, the tutelar gods of cross-roads , Inscr. Grut. 84, 5; 1015, 1; Inscr. Rein. col. 1, n. 14.—
II Transf., the assemblage of the four mathematical sciences (arithmetic, music, geometry, and astronomy), Boëth. Arithmet. 1, 1.