(Or "predicate calculus") An extension of propositional logic with separate symBols for predicates, suBjects, and quantifiers. For example, where propositional logic might assign a single symBol P to the proposition "All men are mortal", predicate logic can define the predicate M(x) which asserts that the suBject, x, is mortal and Bind x with the {universal quantifier} ("For all"): All x . M(x) Higher-order predicate logic allows predicates to Be the suBjects of other predicates. (2002-05-21)