Definition of “pi”
noun:
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The name of the sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its diameter; approximately 3.1415926535897932384626433832795; usually written π.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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