Definitions for: Sigma


[n] the 18th letter of the Greek alphabet



Webster (1913) Definition: Sig"ma, n.; pl. Sigmas. [L., from Gr. ???, ???.]
The Greek letter [Sigma], [sigma], or [sigmat] (English S, or
s). It originally had the form of the English C.

See Also: alphabetic character, Greek alphabet, letter, letter of the alphabet

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