Definitions from Wiktionary (PI)

▸ noun:  The 16th letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek.
▸ noun:  (mathematics) An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its diameter; approximately 3.14159265358979323846264338327950; usually written π.
▸ noun:  (letterpress typography) Metal type that has been spilled, mixed together, or disordered.
▸ verb:  (letterpress typography) To spill or mix printing type.
▸ adjective:  (typography) Not part of the usual font character set; especially, non-Roman type or symbols as opposed to standard alphanumeric Roman type.
▸ noun:  (typography) pica (conventionally, 12 points = 1 pica, 6 picas = 1 inch).
▸ noun:  Piaster.
▸ adjective:  Pious.
▸ noun:  (historical) A county of Chengdu, Sichuan, China.
▸ noun:  Abbreviation of Piauí., a state of Brazil. [A state of the Northeast Region, Brazil. Capital: Teresina]
▸ noun:  Initialism of Prison Industries (the prison-run work program for inmates)
▸ noun:  (US, Philippines, historical, dated) Initialism of Philippine Islands. [islands of the Malay Archipelago on which the country of Philippines is situated]
▸ noun:  (informatics, SGML, XML) Initialism of processing instruction.
▸ noun:  Initialism of partial induction (see AI)
▸ noun:  Initialism of personal injury. [(law) An injury to the body, mind or emotions, as opposed to an injury to property.]
▸ noun:  Initialism of politically incorrect (see PC)
▸ noun:  Initialism of principal investigator (lead researcher on a grant-funded project) [(sciences) lead researcher on a grant-funded project]
▸ noun:  Initialism of private investigator. [An agent hired by a private party for the purpose of investigation or evidence gathering.]
▸ noun:  Initialism of parallel import. [A legitimate product imported from another country without the permission of the intellectual property owner.]
▸ noun:  (biochemistry) Abbreviation of phosphatidylinositol (a phospholipid component of eukaryotic cell membranes, also abbreviated in PtdIns) [(chemistry) a phospholipid containing inositol]
▸ noun:  (pharmacology) Initialism of protease inhibitor. [(biochemistry) Any molecule that inhibits the function of proteases (enzymes that aid the cleavage of proteins), e.g. alpha-1 antitrypsin.]
▸ noun:  (organic chemistry) Initialism of polyimide. [(chemistry) Any polymer whose monomers are imides; used to make high-temperature resins]
▸ noun:  (medicine) Initialism of ponderal index. [An anthropometric statistic that combines the height and weight of a person, similar to the body mass index.]
▸ noun:  (surgery) Initialism of penile inversion.
▸ noun:  (electronics) Initialism of power integrity.
▸ noun:  Abbreviation of prohibited immigrant.
▸ noun:  (fan fiction category) Initialism of pseudoincest. [Sexual involvement between family members who are not blood relations (e.g., siblings by adoption, stepparents and stepchildren, in-laws).]
▸ noun:  (automotive) Initialism of port injection. (fuel injection)
▸ noun:  (psychology) Initialism of paradoxical intention. [(psychotherapy) A psychotherapeutic technique used to treat anxiety by repeatedly rehearsing the anxiety-inducing pattern of thought or behaviour, often with exaggeration and humor.]
▸ noun:  (business) Initialism of pro forma invoice.
▸ noun:  (Philippines, politics) Initialism of People’s Initiative.

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