Definition of pi noun from the Oxford Advanced American Dictionary

     

    pi

     noun
    noun
    NAmE//paɪ//
     
     
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  1. 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 about 3.14159
  2. 2 the 16th letter of the Greek alphabet (Π, π)
See the Oxford Advanced Learner's Dictionary entry: pi

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