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# infinitesimal

[in-fin-i-tes-uh-muh l] /ˌɪn fɪn ɪˈtɛs ə məl/
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, relating to, or involving infinitesimals.
noun
4.
an infinitesimal quantity.
5.
Mathematics. a variable having zero as a limit.
Origin of infinitesimal
1645-1655
1645-55; < New Latin infīnītēsim(us), equivalent to Latin infīnīt(us) infinite + -ēsimus suffix of ordinal numerals + -al1
Related forms
infinitesimality, infinitesimalness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for infinitesimally
• 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.
• If by infinitesimally probabilities, you mean zero, say zero.
• So he does his research anyway and everything he reads tells him the odds of something bad happening are infinitesimally small.
• For an infinitesimally thin surface element, stresses are tangential as radial stresses go to zero on the surface.
• To reach the wall you'd need to take an infinite number of steps, and by the end they'd become infinitesimally small.
• If your tank is half full then the car is lighter and your mileage will improve by an infinitesimally small amount.
• At room temperature, this metal must have an infinitesimally small vapor pressure.
British Dictionary definitions for infinitesimally

## infinitesimal

/ˌɪnfɪnɪˈtɛsɪməl/
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
noun
3.
(maths) an infinitesimal quantity
Derived Forms
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for infinitesimally

## infinitesimal

1710 (1650s as a noun), "infinitely small," from Modern Latin infinitesimus, from Latin infinitus "infinite" (see infinite) + -esimus, as in centesimus "hundredth." Related: Infinitesimally.

Online Etymology Dictionary, © 2010 Douglas Harper
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infinitesimally in Science
 infinitesimal   (ĭn'fĭn-ĭ-těs'ə-məl)    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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### Difficulty index for infinitesimal

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### Word Value for infinitesimally

23
27
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