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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

Sigma

Noun

sig=ma

WORDNET DICTIONARY

sigma(n = noun.communication) Array - the 18th letter of the Greek alphabet; Array

is a kind of alphabetic character, letter, letter of the alphabet

Sigma, n. [L., from Gr. , .].

The Greek letter S, or s). It originally had the form of the English C. [1913 Webster]

Sigma, n. the eighteenth letter of the Greek alphabet.

Etymology

L f. Gk

For further exploring for "Sigma" in Webster Dictionary Online