Binomial

Part of speech: noun (n.)

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

Part of speech: adjective (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. Binomial theorem (Alg.), the theorem which expresses the law of formation of any power of a binomial.