American English

Definition of Mayday noun from the Oxford Advanced American Dictionary

 

Mayday

 noun
noun
NAmE//ˈmeɪdeɪ//
 
[uncountable]
 
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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 the Oxford Advanced Learner's Dictionary entry: Mayday