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pi

 
pronunciation:
paI
features:
Homophone Note
part of speech: noun
definition: a number equal to the ratio of the circumference of a circle to its diameter. The value of pi is approximately 3.1416 or 22/7.
You need to use pi in a formula to find out the area of a circle.
Homophone Note
The words pi and pie (a dessert) sound alike but have different meanings.