Definition of "PI"

Abbreviation of Piauí., a state of Brazil.  examples

Initialism of Prison Industries (the prison-run work program for inmates)  examples

(US, Philippines, historical, dated) Initialism of The Philippine Islands.

(informatics, SGML, XML) Initialism of processing instruction.  examples

Initialism of partial induction (see AI)  examples

Initialism of personal injury.  examples

Initialism of politically incorrect (see PC)  examples

Initialism of principal investigator (lead researcher on a grant-funded project)  examples

Initialism of private investigator.  examples

Initialism of parallel import.  examples

(biochemistry) Abbreviation of phosphatidylinositol (a phospholipid component of eukaryotic cell membranes, also abbreviated in PtdIns)  examples

(pharmacology) Initialism of protease inhibitor.

(organic chemistry) Initialism of polyimide.  examples

(medicine) Initialism of ponderal index.  examples

(surgery) Initialism of penile inversion.  examples

(electronics) Initialism of power integrity.  examples

Abbreviation of prohibited immigrant.  examples

(fan fiction category) Initialism of pseudoincest.  examples

(automotive) Initialism of port injection. (fuel injection)  examples

(psychology) Initialism of paradoxical intention.