1801, in the meaning defined above
infinitesimal
infinitesimal calculus
infinitesimalism
“Infinitesimal calculus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infinitesimal%20calculus. Accessed 30 Dec. 2024.
Britannica.com: Encyclopedia article about infinitesimal calculus
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