Definition:Entropic Structure

Definition
An entropic structure is an algebraic structure $\struct {S, \circ}$ such that $\circ$ is an entropic operation.

That is, such that:
 * $\forall a, b, c, d \in S: \paren {a \circ b} \circ \paren {c \circ d} = \paren {a \circ c} \circ \paren {b \circ d}$

Also known as
An entropic structure is also known as a medial structure.