sigma

[sig-muh]
noun
1.
the 18th letter of the greek alphabet: Σ, σ, ς.
2.
the consonant sound represented by this letter.

Origin:
1600–10; < Latin < Greek sígma

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Collins
World English Dictionary
sigma (ˈsɪɡmə)
 
n
1.  the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
2.  maths the symbol Σ, indicating summation of the numbers or quantities indicated
 
[Greek, of Semitic origin; related to Hebrew samekh]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

sigma sig·ma (sĭg'mə)
n.

Symbol ς The 18th letter of the Greek alphabet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
sigma   (sĭg'mə)  Pronunciation Key 
A sigma baryon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

SIGMA definition


A scientific visual programming environment from NASA.
(http://fi-www.arc.nasa.gov/fia/projects/sigma/).
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
By definition, three sigma events are not supposed to come in battalions.
If we're on the topic of alternatives how about some form of six-sigma normalization of the prices of goods and wages.
Sigma receptors are effected by cocaine, as cocaine functions as a sigma ligand agonist.
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