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capital
noun
°A city designated as a legislative seat by the government or some other authority, often the city in which the government is located; otherwise the most important city within a country or a subdivision of it.
"Washington D.C. is the capital of the United States of America."
°Money and wealth. The means to acquire goods and services, especially in a non-barter system.
"He does not have enough capital to start a business."
adjective
°of prime importance.
°(British) excellent.
"That is a capital idea!"
synonyms: caps, majuscule