1. large-scale or comprehensive changes made to something, affecting many parts or aspects
The building underwent extensive modifications to meet new safety standards.
O edifício passou por modificações extensas para atender aos novos padrões de segurança.
2. significant alterations or improvements made to an object, system, or structure
The software required extensive modifications before it could be deployed.
O software necessitava de modificações extensas antes de ser implantado.