Electronic Communication Network (ECN) An electronic system that attempts to eliminate the role of a third party in the execution of orders entered by an exchange market maker or an over-the-counter market maker, and permits such orders to be entirely or partly executed. Investopedia Says: An ECN connects major brokerages and individual traders so that they can trade directly between themselves without having to go through a middleman. Related Terms: Hybrid Market Market Maker Nasdaq Order Audit Trail System - OATS Over the Counter - OTC Prop Shop SelectNet Small Order Execution System - SOES Trading Session Xetra |