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

xi

noun
 
/saɪ/,
 
/zaɪ/,
 
/ksaɪ/,
 
/ɡzaɪ/
 
/saɪ/,
 
/zaɪ/,
 
/ksaɪ/,
 
/ɡzaɪ/
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  1. the 14th letter of the Greek alphabet (Ξ, ξ)
    Word OriginGreek.
See xi in the Oxford Advanced American Dictionary
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verb
 
 
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