What is the definition of a Yonko in the One Piece manga/anime

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What is the definition of a Yonko in the One Piece manga? Will we see all four Yonko in one story arc? - Quora

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What is the definition of a Yonko in the One Piece manga/anime? Why hasn't Monkey D. Dragon been mentioned as a Yonko yet, if he is one? - Quora

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