From Longman Dictionary of Contemporary Englishtripartitetri‧par‧tite /traɪˈpɑːtaɪt $ -ˈpɑːr-/ adjective [only before noun] formal PGinvolving three parts, groups etctripartite agreement/talks etc a tripartite agreement between France, Britain, and Germany
Examples from the Corpus
tripartite• a tripartite political system• You understand better than perhaps any of your predecessors that ours is a tripartite system of government, with three co-equal branches.Origin tripartite (1400-1500) Latin tripartitus, from tri- + partitus “divided” 