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

sigma

noun
 
/ˈsɪɡmə/
 
/ˈsɪɡmə/
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  1. the 18th letter of the Greek alphabet (Σ, σ)
    Word OriginGreek.
See sigma in the Oxford Advanced American Dictionary
Check pronunciation: sigma

Nearby words

biodegradable
adjective
 
 
From the Topic
The environment
C1
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