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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 In·fin·i·tes·i·mal a.  Infinitely or indefinitely small; less than any assignable quantity or value; very small.
 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.

From: WordNet (r) 2.0

 infinitesimal calculus
      n : the branch of mathematics that is concerned with limits and
          with the differentiation and integration of functions
          [syn: calculus, the calculus]