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epsilon

[ep-suh-lon, -luh n or, esp. British, ep-sahy-luh n] /ˈɛp səˌlɒn, -lən or, esp. British, ɛpˈsaɪ lən/
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
< Greek 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. 2014.
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British Dictionary definitions for ε

epsilon

/ˈɛpsɪˌlɒn; ɛpˈsaɪlən/
noun
1.
the fifth letter of the Greek alphabet (Ε, ε), a short vowel, transliterated as e
Word Origin
Greek e psilon, literally: simple e

Epsilon

/ˈɛpsɪˌlɒn; ɛpˈsaɪlən/
noun
1.
(foll by the genitive case of a specified constellation) the fifth brightest star in a constellation: Epsilon Aurigae
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ε

epsilon

n.

from Greek, literally e psilon "bare -e-, -e- and nothing else," in contradistinction to the diphthong -ai-, which has the same sound. Greek psilon "smooth, simple" is of uncertain origin.

Online Etymology Dictionary, © 2010 Douglas Harper
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ε in Medicine

ε

  1. The Greek letter epsilon. Entries beginning with this character are alphabetized under epsilon.

  2. The symbol for molar absorption coefficient.

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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