Jisho

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Noun
1. prince; dukeSee also 五等爵
Wikipedia definition
2. DukeA duke (male) or duchess (female) can be either a monarch ruling over a duchy or a member of the nobility, historically of highest rank below the monarch. The title comes from French duc, itself from the Latin dux, 'leader', a term used in republican Rome to refer to a military commander without an official rank, and later coming to mean the leading military commander of a province. In the Middle Ages the title signified first among the Germanic monarchies.
Read “Duke” on English Wikipedia
Read “公爵” on Japanese Wikipedia
Read “Duke” on DBpedia

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