the international call for help by a ship in distress, given over the ship's radio. The radio operator would broadcast on the emergencyfrequency, "Mayday, Mayday, Mayday," then give the name and location of his vessel, and specify the assistance needed. Any ships or coast guard installations within range would then be required to render immediate aid. (Mayday is from the French m'aidez meaning "help me!") —Welcome to the SO Glossary Final approval 2-Mar-90