| Definitions | noun (uncountable)
- (context, archaic, calculus) calculus
- 1816: w:John Playfair, John Playfair, Dissertation on the Progress of Mathematical and Physical Science since the Revival of Letters in Europe
- "Of the new or , we are to consider w:Isaac Newton, Sir Isaac Newton as the first inventor, w:Gottfried Leibniz, Leibnitz, a German philosopher, as the second; ..."
- "The fluxionary and differential calculus may be considered two modifications in the matter of notation of one general method, aptly distinguished by the name of the ."
- (context, mathematics, analysis) a systematic employment of infinitesimals that reduces calculus to algebra; nonstandard analysis.
- 1998: John L. Bell, A Primer of Infinitesimal Analysis.
- 2002: E.I. Gordon, A.G. Kusraev, S.S. Kutateladze, Infinitesimal Analysis
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