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

 

xi

 noun
noun
BrE BrE//saɪ//
 
; NAmE NAmE//saɪ//
 
; BrE BrE//zaɪ//
 
; NAmE NAmE//zaɪ//
 
; BrE BrE//ksaɪ//
 
; NAmE NAmE//ksaɪ//
 
; BrE BrE//ɡzaɪ//
 
; NAmE NAmE//ɡzaɪ//
 
 
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the 14th letter of the Greek alphabet (Ξ, ξ) Word OriginGreek.
See the Oxford Advanced American Dictionary entry: xi