What is the meaning of Calculus?

Calculation; computation.

Any formal system in which symbolic expressions are manipulated according to fixed rules.

Differential calculus and integral calculus considered as a single subject.

A stony concretion that forms in a bodily organ.

Deposits of calcium phosphate salts on teeth.

A decision-making method, especially one appropriate for a specialised realm.

diminutive of calx

pebble, stone

reckoning, calculating, calculation

a piece in the latrunculi game

Source: wiktionary.org