This is the 3212th most frequent French word.
retiré
Withdrawn; retired.
In this sentence, 'retiré' is used to indicate the action of removing or taking off something, specifically his coat.
Il a retiré son manteau en entrant dans la pièce.
He took off his coat upon entering the room.
Here, 'retirée' refers to the act of moving away or retiring to a space, in this case, her room for reflection.
Elle s'est retirée dans sa chambre pour réfléchir.
She withdrew to her room to think.
In this usage, 'retiré' signifies an action of removing something from a designation or list.