pi

¹pi

noun \ˈpī\

plural pis\ˈpīz\

Definition of PI

1

: the 16th letter of the Greek alphabet — see alphabet table

2

a : the symbol π denoting the ratio of the circumference of a circle to its diameter b : the ratio itself : a transcendental number having a value rounded to eight decimal places of 3.14159265

Origin of PI

Middle Greek, from Greek pei, of Semitic origin; akin to Hebrew pē pe

First Known Use: 1638

Other Alphabet Terms

cuneiform, linear, minuscule, pictograph, rune, symbology, wedge

Rhymes with PI

ay, aye, bi, Bligh, buy, by, bye, chai, chi, cry, die, dry, dye, eye, fie, fly, fry, guy, hie, high, Huai, i, I, lie, lye, my, nigh, phi, pie, ply, pry, psi, rye, scythe, shy, sigh, sky, Skye, sly, spry, spy, sty, Tai, Thai, thigh, thy, tie, try, vie, why, wry, wye, xi, Y