CEDEXcommon nounproper nounEtymologyexpandabbreviation of "courrier d'entreprise à distribution exceptionnelle".Definition1. Business mail with exceptional delivery. This label on mail in France indicates that it should be delivered by a network specialized in transporting mail to businesses and administrative organizations.flags.Franceexpand83166 Toulon CEDEX 9 est l'adresse postale de la MGEN du Var.