Ruler or monarch of a grand duchy. / Son or grandson of a czar (emperor) of the Russian Empire. (A more literal translation of the Russian would be grand prince.)

(Britain, soccer) winning in each of the three UEFA cups - UEFA Champions League, UEFA Europa League and Cup Winners' Cup (defunct).

(bridge) The bid and winning of all the tricks during the play of one hand. / (sports) The winning of all available, major or specified events in a given year or sports season.

Alternative form of grandaunt

The premier steeplechase (horse race over fences) in the United Kingdom

(idiomatic, colloquial, often humorous) A person who is important or high-ranking. / An extremely pompous person.

(baseball, slang) A grand slam.

Alternative form of granduncle

A form of epilepsy where the seizures are characterized as severe and involve spasms and unconsciousness. A formal medical term would be tonic-clonic seizures.

A small grand piano.