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- 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. 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.

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