Pontiac2 Syllabification: (Pon·ti·ac)Pronunciation: /ˈpäntēˌak/Definition of Pontiac (c.1720–69), Ottawa Indian chief. He is credited with organizing and leading a rebellion against the British, during which he led a year-long siege of Fort Detroit 1763–64. He agreed to terms of peace in 1766. Pontiac in other Oxford dictionaries Definition of Pontiac in the British & World English dictionary