infinitesimal's

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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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
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