Detainer

detainer

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[Anglo-French detenoure, from detenir to restrain, detain, from Old French, from Latin detinere]
1 : the act of keeping something in one's possession
;specif
: unlawful detainer
2 : detention in custody
3 : a notification sent by a prosecutor, judge, or other official advising a prison official that a prisoner is wanted to answer criminal charges and requesting continued detention of the prisoner or notification of the prisoner's impending release compare extradition