Definition of sigma noun from the Oxford Advanced Learner's Dictionary

 

sigma

 noun
noun
BrE BrE//ˈsɪɡmə//
 
; NAmE NAmE//ˈsɪɡmə//
 
 
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the 18th letter of the Greek alphabet (Σ, σ) Word OriginGreek.
See the Oxford Advanced American Dictionary entry: sigma