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



    BrE BrE//paɪ//
    ; NAmE 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 3.14159…
  2. 2 the 16th letter of the Greek alphabet (Π, π)
  3. Word OriginGreek.
See the Oxford Advanced American Dictionary entry: pi

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