TOP

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

sigma

noun
 
/ˈsɪɡmə/
 
/ˈsɪɡmə/
jump to other results
  1. the 18th letter of the Greek alphabet (Σ, σ)
    Word OriginGreek.
See sigma in the Oxford Advanced American Dictionary
previously
adverb
 
 
From the Word list
Oxford 3000
B1
Oxford Learner's Dictionaries Word of the Day