quadripartite
adjective
quad·ri·par·tite ˌkwä-drə-ˈpär-ˌtīt 
1
: consisting of or divided into four parts
2
: shared or participated in by four parties or persons
a quadripartite agreement
Word History
Etymology
Middle English, from Latin quadripartitus, from quadri- + partitus, past participle of partire to divide, from part-, pars part
First Known Use
15th century, in the meaning defined at sense 1