Binomial

Bi·no·mi·al

Binomial

n.
  1. An expression consisting of two terms connected by the sign plus (+) or minus (-); as, a + b, or 7 - 3. (Alg.)

Binomial

a.
  1. Consisting of two terms; pertaining to binomials; as, a binomial root.
  2. Having two names; -- used of the system by which every animal and plant receives two names, the one indicating the genus, the other the species, to which it belongs. (Nat. Hist.)

Phrases & Compounds
Binomial theorem
the theorem which expresses the law of formation of any power of a binomial.