air-to-air data network Airborne Interception radar, a Royal Air Force air-to-air system Air interdiction, an aerial military capability Attitude indicator, a flight instrument on aircraft The Internet .ai, a top-level domain Medical conditions Accommodative insufficiency of the eye Amelogenesis imperfecta of teeth Aortic insufficiency of the heart Medicines and healthcare Active ingredient, part of a drug Adequate intake, a Dietary Reference Intake nutritional parameter Aromatase inhibitor, a class of breast-cancer drug Articulation Index, a method of measuring hearing loss Artificial insemination, a method of fertilisation Visual arts technologies Adobe Illustrator, a vector graphics editor .ai, Adobe Illustrator Artwork filename extension Automatic Maximum-Aperture Indexing, aperture coupling on Nikon camera lenses See also Artificial intelligence (disambiguation) Art Institute (disambiguation) All In (disambiguation) A1 (disambiguation) AL (disambiguation) AY (disambiguation) Aye (disambiguation) Eye (disambiguation)