01 a. Infinitely or indefinitely small; less than any assignable quantity or value; very small.
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1.
Infinitely or indefinitely small; less than any assignable quantity or value; very small.
Phrases & compounds
Infinitesimal calculus —
the different and the integral calculus, when developed according to the method used by Leibnitz, who regarded the increments given to variables as infinitesimal.