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Calculus
(noun)

- A branch of mathematics dealing with derivatives and integrals, and the study of how they relate to the behavior of functions.
- A method of calculation or system of reasoning.
- A tiny concretion or deposit, especially one in the body, such as a calculus in the gallbladder.

### Origin:

From latin calculus, "small stone" (used for counting), from calcarius, "pertaining to lime or limestone", from calx, "lime".

### Examples:

- She was studying calculus in preparation for her engineering degree.
- The calculation of the optimal solution for the problem required advanced calculus.
- The new calculus method allowed for much more efficient computation.
- The scientist developed a calculus to understand the behavior of fluids under pressure.
- The patient had to undergo surgery to remove a calculus that was causing pain in her gallbladder.