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infinitesimal: Meaning and Definition of

in•fin•i•tes•i•mal

Pronunciation: (in"fin-i-tes'u-mul), [key]
— adj.
  1. indefinitely or exceedingly small; minute: infinitesimal vessels in the circulatory system.
  2. immeasurably small; less than an assignable quantity: to an infinitesimal degree.
  3. of, pertaining to, or involving infinitesimals.
—n.
  1. an infinitesimal quantity.
  2. a variable having zero as a limit.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
infinite series infinitesimal calculus
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