capital
US /ˈkæp.ə.t̬əl/
UK /ˈkæp.ə.t̬əl/

1.
the most important city or town of a country or region, usually its seat of government and administrative center
:
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London is the capital of the United Kingdom.
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The new government plans to move the capital city.
2.
3.
a capital letter
:
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Please start each sentence with a capital.
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The word 'France' begins with a capital 'F'.