Grenville, George Syllabification: (Gren·ville, George)Pronunciation: /ˈgrenvəl/Definition of Grenville, George (1712–70), British statesman; prime minister 1763–65. The Stamp Act (1765), which aroused great opposition in the North American colonies, was passed during his term of office. Grenville, George in other Oxford dictionaries Definition of Grenville, George in the British & World English dictionary