English dictionary
sigma
/'s/I/gm/@/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
-
the 18th letter of the Greek alphabet
Source: WordNet 3.0
-
The Greek letter &SIGMA;, σ, or &sigmat; (English <i>S</i>, or <i>s</i>). It originally had the form of the English C.
Source: webster1913