Kata bahasa Indonesia
English word
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
Link, Gadget and Share 
WORDNET DICTIONARY
Noun Sigma has 1 sense
- sigma(n = noun.communication) - the 18th letter of the Greek alphabet; is a member of greek alphabet
is a kind of alphabetic character, letter, letter of the alphabet
CIDE DICTIONARY
Sigma, n. [L., from Gr. , .].
The Greek letter S, or s ). It originally had the form of the English C. [1913 Webster]