Grand-duke meaning

A nobleman who is the sovereign of a grand duchy.
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A son or grandson of a czar in the male line.
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Used as the title for such a nobleman.
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The sovereign ruler of a grand duchy, ranking just below a king.
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In czarist Russia, a prince of the royal family.
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Ruler or monarch of a grand duchy.
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Son or grandson of a czar (emperor) of the Russian Empire. (A more literal translation of the Russian would be "grand prince".)
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Origin of grand-duke

  • Old French grant duc, from Latin grandis + dux, from the verb duco (“to lead”).

    From Wiktionary