ISI uncommon us noun 1. the Pakistan intelligence agency; a powerful and almost autonomous political and military force; has procured nuclear technology and delivery capabilities; has had strong ties with the Taliban and other militant Islamic groups SynonymsDirectorate for Inter-Services IntelligenceInter-Services Intelligence Related words Broader terms international intelligence agency WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
