- (n.) A Greek letter (/, /) corresponding to the Roman letter P.
- (n.) 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.
- (n.) A mass of type confusedly mixed or unsorted.
- (v.t.) To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). pi. Retrieved September 20, 2026, from http://smartdefine.org/pi/definitions/2045255 |
| Chicago | Webster's. 2011. "pi" http://smartdefine.org/pi/definitions/2045255 (accessed September 20, 2026). |
| Harvard | Webster's 2011, pi, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/pi/definitions/2045255>. |
| MLA | Webster's. "pi" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/pi/definitions/2045255> |