AIP

(medicine) Initialism of acute intermittent porphyria.

(printing technology) acoustic inkjet printing

(navy, submarines) Abbreviation of air independent propulsion. (a method of propelling submarines without access to the Earth's atmosphere while using combustion engines (internal or external combustion engines))

(aviation) Abbreviation of aeronautical information publication. (a jurisdictional airspace air navigation manual of the jurisdictional authority)