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EPSILON

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ep⋅si⋅lon

  [ep-suh-lon, -luhn or, especially Brit., ep-sahy-luhn]
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–noun
1. the fifth letter of the Greek alphabet (E, ε).
2. the consonant sound represented by this letter.
3. Mathematics. an arbitrarily small quantity, used to indicate that a given quantity is small, or close to zero.
Origin:
< Gk è psīlón bare, simple e (as opposed to diphthongal spellings which in later Gk represented the same sound)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ep·si·lon   (ěp'sə-lŏn', -lən)   
n.  The fifth letter of the Greek alphabet. See Table at alphabet.

[Greek e psīlon, simple e, from neuter of psīlos, simple.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

epsilon 
from Gk., lit. e psilon "bare -e-, -e- and nothing else," in contradistinction to the diphthong -ai-, which has the same sound.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

epsilon ep·si·lon (ěp'sə-lŏn', -lən)
n.


  1. Symbol ε The fifth letter of the Greek alphabet.

  2. The fifth in a series.

adj.

  1. Of or relating to the fifth member of a particular ordered set.

  2. Relating to or characterizing a polypeptide chain that is one of five types of heavy chains present in immunoglobins.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

EPSILON language
A macro language with high level features including strings and lists, developed by A.P. Ershov at Novosibirsk in 1967. EPSILON was used to implement ALGOL 68 on the M-220.
["Application of the Machine-Oriented Language Epsilon to Software Development", I.V. Pottosin et al, in Machine Oriented Higher Level Languages, W. van der Poel, N-H 1974, pp. 417-434].
[The Jargon File]
(1995-05-10)

epsilon
1. The fifth letter of the Greek alphabet.
2. (From the Hungarian mathematician Paul Erdos) A very small, insignificant, or negligible quantity of something.
The use of epsilon is from the epsilon-delta method of proof in differential calculus.
(2001-07-06)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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Encyclopedia

epsilon

(symbol e), fundamental physical constant expressing the naturally occurring unit of electric charge, equal to 1.6021892 1019 coulomb, or 4.80325 1010 electrostatic unit (esu, or statcoulomb). In addition to the electron, all freely existing charged subatomic particles thus far discovered have an electric charge equal to this value or some whole-number multiple of it. Quarks, which are always bound within larger subatomic particles such as protons and neutrons, have charges of 13 or 23 of this value

Learn more about epsilon with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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