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| pi [ pī ] (plural pis) |
noun |
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| Definition: |
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1. 16th letter of Greek alphabet: the 16th letter of the Greek alphabet, represented in the English alphabet as "p"
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2. mathematical constant: a number approximately equal to 3.14159 that is the ratio of the circumference of a circle to its diameter and is represented by the symbol π
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| [Early 19th century. < Greek] |
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