Mayday

[ mey-dey ]
/ ˈmeɪˌdeɪ /

noun

the international radiotelephone distress signal, used by ships and aircraft.

Origin of Mayday

1925–30; < French (venez) m'aider (come) help me!
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for mayday

Mayday
/ (ˈmeɪˌdeɪ) /

noun

the international radiotelephone distress signal

Word Origin for Mayday

C20: phonetic spelling of French m'aidez help me
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012