Definition of "dux" [dux]

• The top academic student in a school, or in a year of school; the top student in a specified academic discipline. (noun)
• A high-ranking commander in the Roman army, responsible for more than one legion. (noun)
• The subject of a fugue, answered by the comes. (noun)

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• "By comparison, the mantle of the giant squid, Architeuthis dux, is not known to attain more than 2.25 metres."
• "Tacitus [103] styles Vespasian dux, which is not a strictly official title, but exactly describes his actual duty."
• "Byzantium, Gaeta had then, like Naples and Amalfi, a republican form of government under a "dux" or lord."