IPA: /ˈsteɪtəˌrum/
KK: /ˈsteɪtərum/
A private room on a ship or train that has sleeping space and sometimes a bathroom.
We booked a stateroom for our cruise to the Caribbean.
Stateroom is formed from "state" (from Old French *estât*, meaning condition or status) and "room" (from Old English *rum*, meaning space or area). A stateroom originally referred to a room designated for a specific status or condition, often used for important guests or officials.
Think of a 'state' as a specific 'condition' or 'status' and a 'room' as a space — a stateroom is a special space for important people.