1. modifications made to add new technology or features to older systems

1. to furnish with new or modified parts or equipment not available or considered necessary at the time of manufacture

Examples

• The company retrofits old buildings with energy-efficient windows.
• They decided to retrofit the factory with modern safety equipment.
• The city retrofits streetlights with LED bulbs to save energy.
• These retrofits will improve the building’s earthquake resistance.
• The aircraft underwent several retrofits during its service life.
• Expensive retrofits are often needed for older homes.
• The school retrofits its computers every few years.