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lavatory
Noun
pl: lavatories
This term carries a clinical or formal tone, often associated with public transportation, aircraft, or institutional settings. It avoids the bluntness of toilet and the casual nature of bathroom, positioning itself as a polite, technical designation for a sanitation facility. In modern usage, it frequently refers specifically to the compact, self-contained units found in planes or trains. While it can refer to the room itself or the plumbing fixture, it is rarely used in domestic, home-based contexts where bathroom or restroom is preferred.