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definition of the word pi

by the Wiktionnary

Singular
pi

Plural
pis

pi (plural pis)

  1. The name of the sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek.
  2. (mathematics) An irrational constant representing the ratio of the circumference of a circle to its diameter; approximately 3.1415926535897932; usually written π.
  3. (metal typesetting) Metal type that has been spilled, mixed together, or disordered. Also called pie.


Definition from Wiktionary
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