Initialism of process window index.

Initialism of Pro Wrestling Illustrated. / (computing) Initialism of Public Windows Interface. / (video games) Initialism of Perfect World International.

plural of PWI

(informal) Initialism of possession with intent to distribute.

(medicine) Initialism of people who inject drugs.

(knitting) Acronym of purlwise.

Pronunciation spelling of princess.

(England & Wales, criminal law) Acronym of possession with intent to supply; the criminal offence of being in possession of an illegal drug with the intent to deal or otherwise supply it to another person; typically by being in possession of a quantity sufficiently large enough that it is implausible to claim that it is for personal use under the circumstances.