polynomialPronunciation: /ˌpɒlɪˈnəʊmɪəl/Definition of polynomial adjective consisting of several terms. noun Mathematics an expression of more than two algebraic terms, especially the sum of several terms that contain different powers of the same variable(s). Biology a Latin name with more than two parts. Origin: late 17th century: from poly- 'many', on the pattern of multinomialpolynomial in other Oxford dictionaries Definition of polynomial in the US English dictionary