Hypertext Webster Gateway: "infinitesimal"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Infinitesimal \In`fin*i*tes"i*mal\, a. [Cf. F. infinit['e]simal,
fr. infinit['e]sime infinitely small, fr. L. infinitus. See
{Infinite}, 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 Webster's Revised Unabridged Dictionary (1913) (web1913)
Infinitesimal \In`fin*i*tes"i*mal\, n. (Math.)
An infinitely small quantity; that which is less than any
assignable quantity.
From WordNet (r) 1.7 (wn)
infinitesimal
adj : infinitely or immeasurably small; "two minute whiplike
threads of protoplasm"; "reduced to a microscopic
scale" [syn: {minute}, {microscopic}]
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