PI
\pˈa͡ɪ], \pˈaɪ], \p_ˈaɪ]\
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By Princeton University
By DataStellar Co., Ltd

Specif.: (Math.) The letter /, /, as used to denote the number or quotient approximately expressing the ratio of the circumference of a circle to its diameter; also, the quotient or the ratio itself. The value of the quotient pi, to eight decimal places, is 3.14159265. The quotient pi cannot be expressed as a root of an algebraic equation; and from this fact follows the impossibility of the quadrature of the circle by purely algebraic processes, or by the aid of a ruler and compass.

A mass of type confusedly mixed or unsorted.

To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form.

A Greek letter (, ) corresponding to the Roman letter P.
By Oddity Software

A mass of type confusedly mixed or unsorted.

To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form.

A Greek letter (, ) corresponding to the Roman letter P.

Specif.: (Math.) The letter , as used to denote the number or quotient approximately expressing the ratio of the circumference of a circle to its diameter; also, the quotient or the ratio itself.
By Noah Webster.
By William Dodge Lewis, Edgar Arthur Singer
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Frederick LockerLampson
 An English poet; born Greenwich, 29, 1821; died at Rowfant, May 30, 1895. He wrote "society verses", among them :"London Lyrics"(1857); "Lyra Elegantiarum"(1867); "Patchwork"(1879).