Definition: EAS stands for "Emergency Alert System". It replaced the old "EBS", Emergency Broadcast System. EAS is an electronic system which uses the Radio infrastructure to alert the general public to emergency situations including weather, safety and homeland security. It requires certain smaller, less important Radio stations to give their programming over to larger, more important stations for the purpose of information dissemination. An EAS Test is a real-time test of the system to insure the audio link between each station works properly.