Source : Webster's Revised Unabridged Dictionary (1913)

Polynomial \Pol`y*no"mi*al\, a.
   1. Containing many names or terms; multinominal; as, the
      polynomial theorem.

   2. Consisting of two or more words; having names consisting
      of two or more words; as, a polynomial name; polynomial
      nomenclature.

Polynomial \Pol`y*no"mi*al\, n. [Poly- + -nomial, as in
   monomial, binomial: cf. F. polyn[^o]me.] (Alg.)
   An expression composed of two or more terms, connected by the
   signs plus or minus; as, a^{2} - 2ab + b^{2}.

Source : WordNet®

polynomial
     adj : having the character of a polynomial; "a polynomial
           expression" [syn: {multinomial}]
     n : a mathematical expression that is the sum of a number of
         terms [syn: {multinomial}]

Source : Free On-Line Dictionary of Computing

polynomial
     
        1.  An arithmetic expression composed by summing
        multiples of powers of some variable.
     
        	P(x) = sum a_i x^i for i = 0 .. N
     
        The multipliers, a_i, are known as "{coefficient}s" and N, the
        highest power of x with a non-zero coefficient, is known as
        the "degree" of the polynomial.  If N=0 then P(x) is constant,
        if N=1, P(x) is linear in x.  N=2 gives a "{quadratic}" and
        N=3, a "cubic".
     
        2.  {polynomial-time}.