sigma
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sig·ma
(sĭg′mə)n.
1. The 18th letter of the Greek alphabet. See Table at alphabet.
2. A sigma factor.
3. Statistics The standard deviation of a given probability distribution or a given set of data.
sig′mate′ (-māt′) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
sigma
(ˈsɪɡmə)n
1. (Letters of the Alphabet (Foreign)) the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
2. (Mathematics) maths the symbol Σ, indicating summation of the numbers or quantities indicated
[Greek, of Semitic origin; related to Hebrew samekh]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
sig•ma
(ˈsɪg mə)n., pl. -mas.
the 18th letter of the Greek alphabet: Σ, σ, ς.
[1600–10; < Latin < Greek sígma]
sig•mate (ˈsɪg mɪt, -meɪt) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Noun | 1. | sigma - the 18th letter of the Greek alphabet Greek alphabet - the alphabet used by ancient Greeks alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters" |
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