The title of grand duke or grand duchess, with its pertaining privileges and obligations; contrast grand duchy.

The wife or widow of a grand duke. / (proscribed) The wife of a grand prince.

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

plural of Grand Master

plural of grand poobah

plural of Grand Poobah

plural of grand piano

(music) the C note exactly one octave above high C

plural of grand slam

An unusual ruler's title, sometimes incorrectly rendered as grand duke, mainly used in Lithuania and some parts of Russia (Muscovy would ultimately unite most Russian principalities and rise to imperial rank) and the Holy Roman Empire.