1. the system of pipes, fixtures, and fittings that supply water and remove waste in a building
2. the work or trade of installing and repairing water pipes and fixtures

Examples

• The old house needs new plumbing throughout.
• We called a professional to fix the plumbing in the kitchen.
• The plumbing in this building is over fifty years old.
• He learned plumbing as a trade after high school.
• The burst pipe caused serious damage to the plumbing system.
• She’s studying plumbing at the technical college.
• The apartment’s plumbing includes modern fixtures and efficient pipes.