noun

An algebraic expression of the sum or the difference of two terms.

Al-Khwarizmi’s concept of algebra can now be grasped with greater precision: it concerns the theory of linear and quadratic equations with a single unknown, and the elementary arithmetic of relative binomials and trinomials.…

adjective

Consisting of two terms.

Cotes discovered an important theorem on the nth roots of unity, anticipated the method of least squares and discovered a method of integrating rational fractions with binomial denominators.