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Definition of infinitesimal:

  1. An infinitely small quantity; that which is less than any assignable quantity.
  2. Infinitely or indefinitely small; less than any assignable quantity or value; very small.


itty-bitty, little bitty, diminutive, teensy, narrow, teeny, bitsy, wee, weeny, slight, negligible, little, miniature, midget, microscopic, teensy-weensy, imperceptible, microminiature, minute, discreet, tiny, big, minuscule, small, atomic, teeny-weeny, bitty.

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