Definition of "PI"
PI
proper noun
(US, Philippines, historical, dated) Initialism of The Philippine Islands.
noun
countable and uncountable, plural PIs
(informatics, SGML, XML) Initialism of processing instruction.
(biochemistry) Abbreviation of phosphatidylinositol (a phospholipid component of eukaryotic cell membranes, also abbreviated in PtdIns)
(pharmacology) Initialism of protease inhibitor.
(organic chemistry) Initialism of polyimide.
(medicine) Initialism of ponderal index.
(surgery) Initialism of penile inversion.
(electronics) Initialism of power integrity.
(fan fiction category) Initialism of pseudoincest.
(psychology) Initialism of paradoxical intention.