This is the 11856th most frequent French word.
substantiellement
"Substantiellement" means "substantially" or "considerably" in English.
Here, 'substantiellement' means significantly or to a large extent, modifying the verb 'augmenté' (increased).
Le coût des réparations a augmenté substantiellement après l'inspection.
The cost of repairs increased substantially after the inspection.
In this sentence, 'substantiellement' describes the extent of the improvement, emphasizing a significant degree.
La qualité des produits s'est améliorée substantiellement grâce aux nouvelles techniques.
The quality of the products substantially improved thanks to the new techniques.
This usage shows 'substantiellement' as modifying 'progressed', indicating a considerable development in efficiency.