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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 ] |