The Collaborative International Dictionary of English v.0.48:
Multinomial \Mul`ti*no"mi*al\, n. & a. [Multi- + -nomial, as in binomial. See Binomial.] (Alg.) Same as Polynomial. [1913 Webster] MultinominalWordNet (r) 3.0 (2006):
multinomial adj 1: having the character of a polynomial; "a polynomial expression" [syn: polynomial, multinomial] n 1: a mathematical function that is the sum of a number of terms [syn: polynomial, multinomial]