Passage: Taipei (; Mandarin: [tʰǎipèi]; Hokkien POJ: Tâi-pak), officially known as Taipei City, is the capital and a special municipality of Taiwan (officially the Republic of China, "ROC"). Located in the northern part of the Island of Taiwan, Taipei City is an enclave of the municipality of New Taipei City that sits about 25 km (16 mi) southwest of the northern port city Keelung. Most of the city is located in the Taipei Basin, an ancient lakebed. The basin is bounded by the relatively narrow valleys of the Keelung and Xindian rivers, which join to form the Tamsui River along the city's western border.The city proper is home to an estimated population of 2,704,810 (2015), forming the core part of the Taipei–Keelung metropolitan area, which includes the nearby cities of New Taipei and Keelung with a population of 7,047,559, the 40th most-populous urban area in the world—roughly one-third of Taiwanese citizens live in the metro district. The name "Taipei" can refer either to the whole metropolitan area or the city proper.

Question: What does the name Taipei mean?
metropolitan area or the city proper