The capital of Pakistan, a modern planned city in the north of the country, which replaced Rawalpindi as capital in 1967; population 673,800 (est. 2009).
Definition of Islamabad in US English:
Islamabad
proper nounizˈlaməˌbadɪzˈlæməˌbæd
The capital of Pakistan, a modern planned city in the north of the country; population 673,800 (est. 2009). It replaced Rawalpindi as the capital in 1967.