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sigma
[ sig-muh ]
/ ˈsɪg mə /
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noun
the 18th letter of the Greek alphabet: Σ, σ, ς.
the consonant sound represented by this letter.
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Origin of sigma
1600–10; <Latin <Greek sígma
Words nearby sigma
SIGINT, Sigismund, Sigismund II, sigla, siglos, sigma, sigma baryon, sigma factor, sigma particle, sigmate, sigmatism
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
How to use sigma in a sentence
British Dictionary definitions for sigma
sigma
/ (ˈsɪɡmə) /
noun
the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
maths the symbol Σ, indicating summation of the numbers or quantities indicated
Word Origin for sigma
Greek, of Semitic origin; related to Hebrew samekh
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
Medical definitions for sigma
sigma
[ sĭg′mə ]
n.
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.
Scientific definitions for sigma
sigma
[ sĭg′mə ]
A sigma baryon.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.