Source : Webster's Revised Unabridged Dictionary (1913)

Quadrivial \Quad*riv"i*al\, n.
   One of the four ``liberal arts'' making up the quadrivium.

Quadrivial \Quad*riv"i*al\, a. [L. quadrivium a place where four
   ways meet; quattuor four + via way.]
   Having four ways meeting in a point. --B. Jonson.