What does "grand duchy" mean?

The territory owned, ruled, or reigned over by a grand duke or grand duchess; contrast grand dukedom.

What is a synonym for "grand duchy"?

Common synonyms include: ally, body politic, buffer state, chieftaincy, city state, colony.

noun

noun ·Rare ·Advanced level

Noun

1
The territory owned, ruled, or reigned over by a grand duke or grand duchess; contrast grand dukedom.
2
the domain controlled by a grand duke or grand duchess wordnet