polytomy
/pəˈlɪtəmi/noun
1 Logic and Statistics. A division or classification into several (usually more than three) groups or subsets; (in later use also) the assignment of three or more possible values to a categorical variable.
2 Biology and Taxonomy. Division into more than two branches at the same point or node; the occurrence of such branching.
Origin
Early 19th century; earliest use found in John Richardson (1797–1852), author. From poly- + -tomy, after German Polytomie.