quādrĭvĭum, 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.
quādrĭvĭus, a, um, adj. [quadrusvia], of the cross-roads, only in the phrase DIS or LARIBVS QVADRIVIIS (sometimes QVADRIBIS), Inscr. Orell. 389; 1664; 2103 sqq.