 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. 

The words
pi and
pie (a dessert) sound alike but have different meanings.