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

psi

noun
 
/psaɪ/,
 
/saɪ/
 
/psaɪ/,
 
/saɪ/
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  1. the 23rd letter of the Greek alphabet (Ψ, ψ)
    Word OriginGreek.
See psi in the Oxford Advanced American Dictionary
Check pronunciation: psi

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brink
noun
 
 
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Danger
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