This is the 2917th most frequent French word.
extension
Extension (French): Expansion or increase in size, scope, or duration.
In this context, 'extension' refers to a physical enlargement or addition to the structure of the house.
L'extension de la maison a nécessité un permis de construire.
The extension of the house required a building permit.
Here, 'extension' signifies a software add-on that expands the capability of an existing program or application.
Il a téléchargé une extension pour améliorer les fonctionnalités de son navigateur.
He downloaded an extension to improve the features of his browser.
In this usage, 'extension' pertains to an extended period of time granted to accomplish something, such as a project.