Definition of Mayday noun from the Oxford Advanced Learner's Dictionary

 

Mayday

 noun
noun
BrE BrE//ˈmeɪdeɪ//
 
; NAmE NAmE//ˈmeɪdeɪ//
 
[uncountable] Travelling by boat or ship
 
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an international radio signal used by ships and aircraft needing help when they are in danger From the French venez m’aider ‘come and help me’. See related entries: Travelling by boat or ship
See the Oxford Advanced American Dictionary entry: Mayday