A two-sided market, also called a two-sided network, is an intermediary economic platform having two distinct user groups that provide each other with network benefits.

(algebra) A subset of a ring which is both a left ideal and a right ideal. Commonly referred to simply as an ideal, but referred to as two-sided ideal for emphasis.

In mathematics, the two-sided Laplace transform or bilateral Laplace transform is an integral transform equivalent to probability's moment-generating function.