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English definition of “king”

king

noun [C]  /kɪŋ/ us  
a man who rules a country because he has been born into a family which by tradition or law has the right to rule, or the title given to such a man: King Philip IV of Spain A king is a playing piece in the game of chess and each player’s most important piece. A king is also a playing card with a picture of a king on it: the king of hearts If someone or something is called the king of an activity, that person is the best or the most important in that activity: He was baseball’s home run king.
(Definition of king from the Cambridge Academic Content Dictionary © Cambridge University Press)
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