(law enforcement) internal affairs department / (robotics) intelligent assist device / (neurology, pathology) Initialism of Internet addiction disorder.

Initialism of International Dyslexia Association.

Initialism of Iceland Air Defense System. / Initialism of Integrated Air Defense System.

Initialism of interactive display system.

Forming the name of an epic about the indicated topic.

(rare) A period of time from one occurrence of an (indicated, regularly recurrent) event to the next.

plural of IAD