multivalued
/ˌmʌltɪˈvaljuːd/adjective
1 Mathematics. Of a function: having the property that a single argument may map to more than one value.
2 Logic. Designating a logic in which a proposition can be assigned any of three or more values, rather than being restricted to the values of truth and falsity. Cf many-valued.
3 Generally. Having or involving more than one value.
Origin
Early 20th century; earliest use found in American Journal of Mathematics. From multi- + valued. With sense 1 compare earlier one-valued, single-valued.