1. to add new or modified parts or equipment to something that already exists

1. the act or process of adding new or modified parts or equipment to something existing

Examples

• The city decided to retrofit all old buildings with earthquake-resistant features.
• They will retrofit the factory with new safety equipment.
• The retrofit of the school’s heating system took three months.
• Many homeowners are retrofitting their houses with solar panels.
• The airline plans to retrofit its entire fleet with new seats.
• The building’s energy retrofit reduced heating costs by 40%.
• Engineers recommended a seismic retrofit for the bridge.