registered representative re·gis·te·redrepresentative uncommon noun 1. someone in charge of a client''s account for an advertising agency or brokerage or other service business Synonymsaccount executiveaccount representativeregistered representativecustomer's brokercustomer's man Related words Broader terms businessperson WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.