(calculus) Differential calculus and integral calculus considered together as a single subject.

(computing theory) Any of a family of functionally complete algebraic systems in which lambda expressions are evaluated according to a fixed set of rules to produce values, which may themselves be lambda expressions.

(calculus) The calculus that deals with instantaneous rates of change.

A hard crust of calcium salts and food particles on the teeth, developing from plaque.

(calculus) The form of calculus that deals with the maxima and minima of definite integrals of functions of many variables.

(mathematical analysis, uncountable) The branch of mathematics that studies generalisations of calculus to allow noninteger (i.e., real or complex) powers of the differentiation operator D and the integration operator J; (countable) any one of said generalisations of calculus.

(calculus) The study of calculus from the perspective of the theory of operators.

(mathematics) A formal system in which index notation is used to define tensors and tensor fields and the rules for their manipulation; the theory of tensor calculus as developed by Gregorio Ricci-Curbastro, which formed the foundation of the modern theory.

(mathematics, logic) A set of inference rules for deriving true sequents from other true sequents.

(medicine) A spiky urinary calculus resembling a piece from the game of jacks.