Noun
Any solid concretion, formed in any part of the body, but most frequent in the organs that act as reservoirs, and in the passages connected with them; as, biliary calculi; urinary calculi, etc.
A method of computation; any process of reasoning by the use of symbols; any branch of mathematics that may involve calculation.
Source: Webster's dictionaryThe calculus of utility aims at supplying the ordinary wants of man at the least cost of labour. William Stanley Jevons
Calculus required continuity, and continuity was supposed to require the infinitely little but nobody could discover what the infinitely little might be. Bertrand Russell
I never failed in mathematics. Before I was fifteen I had mastered differential and integral calculus. Albert Einstein
The calculus of probabilities, when confined within just limits, ought to interest, in an equal degree, the mathematician, the experimentalist, and the statesman. François Arago
Geometric calculus consists in a system of operations analogous to those of algebraic calculus, but in which the entities on which the calculations are carried out, instead of being numbers, are geometric entities which we shall define. Giuseppe Peano
If one looks at the different problems of the integral calculus which arise naturally when one wishes to go deep into the different parts of physics, it is impossible not to be struck by the analogies existing. Henri Poincaré