Lexic.us

Definition of Sigma

1. Noun. The 18th letter of the Greek alphabet.

Definition of Sigma

1. n. The Greek letter Σ, σ, or &sigmat; (English S, or s). It originally had the form of the English C.

Definition of Sigma

1. Noun. The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient. ¹

2. Noun. (mathematics) The symbol '''?''', used to indicate summation of a set or series. ¹

3. Noun. (statistics) The symbol '''?''', used to indicate one standard deviation from the mean, particularly in a normal distribution. ¹

¹ Source: wiktionary.com

Definition of Sigma

1. a Greek letter [n -S] : SIGMATE [adj]

Medical Definition of Sigma

1. The 18th letter of the Greek alphabet, σ. (05 Mar 2000)

Lexicographical Neighbors of Sigma

Literary usage of Sigma

Below you will find example usage of this term as found in modern and/or classical literature:

1. Pan-Organizational Summit on the U.S. Science and Engineering Workforce by Marye Anne Fox, ( (2003)
"... NACME, National Society of Black Physicists, RAND, SACNAS, and sigma Xi ... sigma Xi, and WEPAN *Note: While addressed here as a separate concern, ..."

2. The Journal of Educational Researchby American Educational Research Association by American Educational Research Association (1921)
"sigma 3. the new addition, is designed for grades 6 to 12. ... sigma 2, which is to fill the gap between sigma i and sigma 3, will be issued in a few months ..."

3. Journal of Applied Psychology by American Psychological Association, American Association for Applied Psychology (1918)
"The difference in reaction-time was now of about the same magnitude as before,—forefinger, 140 sigma; second finger, 200 sigma; third finger, 260 sigma; ..."

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