Definition:Binomial


 * Euclidean Number Theory: A binomial: a term in the form $a + b$ where $\dfrac a b$ and $a + b$ are irrational but $\left({\dfrac a b}\right)^2$ is rational. The concept is considered archaic.


 * Algebra: An expression of the form $a + b$, where $a$ and $b$ are (generally) variables whose domains are numbers.

Also see

 * Binomial Theorem
 * Definition:Binomial Coefficient