This is the 11151st most frequent French word.
prolongement
Extension; prolongation.
prolongement is used here to indicate a structural extension or expansion.
Le prolongement de la ligne de métro facilitera les déplacements.
The extension of the metro line will facilitate travel.
prolongement refers to a figurative continuation or resulting extension.
Dans le prolongement de ses efforts, il a obtenu une récompense.
As a result of his continued efforts, he received a reward.
prolongement depicts a temporal extension of an experience or state.