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English Dictionary - With Multi-Lingual Search Definitions sigma 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 (σ) is used to indicate one standard deviation from the mean, particularly in a normal distribution.      Full Definition of sigma  Find:   Words Starting With:   Words Ending With:   Words Containing:   Words That Match:    Translate Into:    Dutch   French   German    Italian   Spanish     Show 51015202550 results per page. Enter your search terms Submit search form   Web www.allwords.com Browse the Dictionary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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