This is the 226th most frequent French word.
lorsque
"When" or "while."
In this sentence, 'lorsque' functions as a conjunction introducing a time-dependent clause, indicating a past occurrence.
Lorsque j'étais jeune, j'avais un chien.
When I was young, I had a dog.
Here, 'lorsque' introduces a temporal clause indicating a simultaneous action in the present or near future.
N'oubliez pas de fermer la porte lorsque vous quittez la pièce.
Do not forget to close the door when you leave the room.
In this sentence, 'lorsque' again acts as a conjunction to introduce a temporal clause in reference to a future event.