PI


Meaning of PI in English

/ paɪ; NAmE / noun

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.

the 16th letter of the Greek alphabet (Π, π)

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WORD ORIGIN

Greek .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.