infinitesimal

[in-fin-i-tes-uh-muhl]
adjective
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.
noun
4.
an infinitesimal quantity.
5.
Mathematics. a variable having zero as a limit.

Origin:
1645–55; < Neo-Latin infīnītēsim(us), equivalent to Latin infīnīt(us) infinite + -ēsimus suffix of ordinal numerals + -al1

infinitesimality, infinitesimalness, noun
infinitesimally, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infinitesimal (ˌɪnfɪnɪˈtɛsɪməl)
 
adj
1.  infinitely or immeasurably small
2.  maths of, relating to, or involving a small change in the value of a variable that approaches zero as a limit
 
n
3.  maths an infinitesimal quantity
 
infini'tesimally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

infinitesimal
1710, "infinitely small," from Mod.L. infinitesimus, coined by Ger. philosopher and mathematician Baron Gottfried Wilhelm von Leibniz (1646-1716) from L. infinitus "infinite" (see infinite) + -esimus, as in centesimus "hundredth."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
infinitesimal   (ĭn'fĭn-ĭ-těs'ə-məl)  Pronunciation Key 
Adjective   Capable of having values approaching zero as a limit.

Noun   A function or variable continuously approaching zero as a limit.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Even the infinitesimally small and nutty realm of the quantum can't escape this
  sort of binary logic.
Another way is that who would discover something so infinitesimally small and
  why.
T cells have the ability to search out infinitesimally tiny markers on cells.
The odds that the bullets collide are infinitesimally small.
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