adj consisting of two terms; pertaining to binomials; as, a binomial root.
2. binomial ·noun an expression consisting of two terms connected by the sign plus (+) or minus (-); as, a + b, or 7 - 3.
3. binomial ·adj 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.