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

 

eta

 noun
noun
BrE BrE//ˈiːtə//
 
; NAmE NAmE//ˈiːtə//
 
 
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the 7th letter of the Greek alphabet (H, η) Word Originfrom Greek ēta.
See the Oxford Advanced American Dictionary entry: eta

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