stateroom Syllabification: (state·room)Pronunciation: /ˈstātˌro͞om, -ˌro͝om/Definition of stateroom noun a private compartment on a ship. a captain’s or superior officer’s room on a ship. North American a private compartment on a train. a large room in a palace or public building, for use on formal occasions. stateroom in other Oxford dictionaries Definition of stateroom in the British & World English dictionary