city and port on both sides of the Thames River in southeastern England; capital of the United Kingdom formerly constituting an administrative county; comprises the City of London (approximately coextensive with ancientLon*din*i*um\län-ˈdi-nē-əm,lən-\; population 7400) and 32 other boroughs, which together are referred to as the metropolitan county ofGreater London (area 632 square miles, or 1637 square kilometers, population 8,174,000)
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city on the Thames River in southeastern Ontario, Canada population 366,151