An algebraic structure where and are idempotent binary operators, is a unary involutory operator (called "complement"), and 0 and 1 are nullary operators (i.e., constants), such that is a commutative monoid, is a commutative monoid, and distribute with respect to each other, and such that combining two complementary elements through one binary operator yields the identity of the other binary operator. (See Boolean algebra (structure)#Axiomatics.)
Specifically, an algebra in which all elements can take only one of two values (typically 0 and 1, or "true" and "false") and are subject to operations based on AND, OR and NOT