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sigma

   Also found in: Dictionary/thesaurus, Acronyms, Encyclopedia, Wikipedia 0.01 sec.
sig·ma (sgm)
n.
Symbol The 18th letter of the Greek alphabet.

sigma
[sig′mə]
Σ, σ, and s, the eighteenth letter of the Greek alphabet.

sigma
the Greek letter σ or σ; the former frequently denotes a standard deviation, the latter is used in mathematics for the sum of the values of the term nominated.


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The Sigma Pi fraternity is the lead sponsor of the annual Sleep Out for the Homeless.
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