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Mayday definition

May·day (mā′dā′)

noun

the international radiotelephone signal for help, used by ships and aircraft in distress

Etymology: prob. short for Fr (venez) m'aider, (come) help me

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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