AGA KHAN Meaning of AGA KHAN in English A ‧ ga Khan, the /ˌɑːɡə ˈkɑːn/ BrE AmE (1936–) the Arab religious leader of a Muslim group called the Ismailis. He is very rich and owns many ↑ racehorse s . Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012