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  Dictionary Definition of pis

pi [1]
noun ( plural pis )

1. the sixteenth letter ( P, p) of the Greek alphabet.
2. Mathematics. a. the letter p, used as the symbol for the ratio (3.141592+) of the circumference of a circle to its diameter. b. the ratio itself.
[Greek; in def. 2 the initial letter of periphéreia PERIPHERY ]