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

pi

noun
 
/paɪ/
 
/paɪ/
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  1. (geometry) the symbol π used to show the ratio of the circumference of (= distance around) a circle to its diameter (= distance across), that is 3.14159…
  2. the 16th letter of the Greek alphabet (Π, π)
    3. Word OriginGreek.
See pi in the Oxford Advanced American DictionarySee pi in the Oxford Learner's Dictionary of Academic English
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