the differential calculus and the integral calculus, considered together.
For All “Intents and Purposes” vs. “Intensive Purposes”Both for all intents and purposes and for all intensive purposes are widely used to mean “for all practical purposes” or “virtually.” But which one is correct? The standard idiom is for all intents and purposes, not for all intensive purposes, though if you were to say these two forms out loud it might be hard to tell the difference between the two. For all …
Origin of infinitesimal calculus
First recorded in 1795–1805
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for infinitesimal calculus
another name for calculus (def. 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012