| Definitions | | sigma |
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noun
- 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.
- (mathematics): the symbol (Σ) is used to indicate summation of a set or series.
- (statistics): the symbol (�) is used to indicate one standard deviation from the mean, particularly in a normal distribution.
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Full Definition of sigma
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