Definitions
sigma Tweet Definition of sigma Like Definition of sigma on Facebook
noun 
  1. The name for the eighteenth letter of the Classical Greek, Classical and Modern Greek, the nineteenth letter of Old Greek, Old and Ancient Greek, Ancient.
  2. (mathematics): the symbol (Σ) is used to indicate summation of a set or series.
  3. (statistics): the symbol (�) is used to indicate one standard deviation from the mean, particularly in a normal distribution.
Translations: 
  • Dutch: sigma

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