détention

/de.tɑ̃.sjɔ̃/
1.
nounfeminineSing

imprisonment; being held in custody (including pre-trial detention)

Il a été placé en détention provisoire en attendant son procès.

He was placed in pre-trial detention while awaiting his trial.

2.
nounfeminineSing

possession (of an object, e.g., weapons, drugs) — often used in legal contexts

La détention d'armes sans permis est illégale.

The possession of weapons without a permit is illegal.