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

 

zeta

 noun
noun
BrE BrE//ˈziːtə//
 
; NAmE NAmE//ˈziːtə//
 
 
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the 6th letter of the Greek alphabet (Z, ζ) Word OriginGreek.
See the Oxford Advanced American Dictionary entry: zeta