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- 1 (plural calculuses) (also infinitesimal calculus) [mass noun] the branch of mathematics that deals with the finding and properties of derivatives and integrals of functions, by methods originally based on the summation of infinitesimal differences. The two main types are differential calculus and integral calculus.
- another term for tartar.
mid 17th century: from Latin, literally 'small pebble (as used on an abacus)'