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Definition of Grand duchy
1. Noun. The domain controlled by a grand duke or grand duchess.
Definition of Grand duchy
1. Noun. A dominion or nation ruled by an grand duke or grand duchess as a self-governing state. See also: duchy ¹
2. Noun. The territory owned, ruled, or reigned over by a grand duke or grand duchess; contrast (term grand dukedom). ¹
¹ Source: wiktionary.com