Binomial

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

Consisting of two terms; pertaining to binomials; as, a binomial root.

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.

Involving two terms or parts

Relating to an algebraic expression with two terms

(mathematics) a quantity expressed as a sum or difference of two terms; a polynomial with two terms