Main Entry:*

cal·cu·lus

Function:

noun

Inflected Form(s):

plural cal·cu·li \ also cal·cu·lus·es

Etymology:

Latin, stone (used in reckoning)

Date:

1666

: a branch of mathematics concerned chiefly with the study of the rate of change of functions with respect to their variables especially through the use of derivatives and differentials.

*Definition as stated in Merriam-Webster Dictionary