1. a room containing a toilet and usually a sink
Usage: formal
2. a toilet fixture
Usage: formal
3. a washbasin or sink for washing hands and face
Usage: formal; dated

Examples

• The airplane lavatory was occupied during takeoff.
• Please wash your hands in the lavatory before dinner.
• The school installed new lavatories in the main building.
• She excused herself to use the lavatory.
• The hotel room had a private lavatory with marble fixtures.
• The lavatory door was marked with a clear sign.
• He splashed cold water on his face at the lavatory.