leading in four directions; concerning a four-way junction
• (n.) One of the four `liberal arts` making up the quadrivium. • (a.) Having four ways meeting in a point.
Quad·riv'i·al adjective [ Latin quadrivium a place where four ways meet; quattuor four + via way.] Having four ways meeting in a point. B. Jonson. 
having four ways or roads meeting in a point. · (of ways or roads) leading in four directions. · of or pertaining to the quadrivium.