- the first day of May, traditionally a celebration of the coming of spring: in some countries now observed as a holiday in honour of workers
WordReference Random House Unabridged Dictionary of American English © 2017
- Middle English 1225–75
May•day (mā′dā′),USA pronunciation n.
- Telecommunicationsthe international radiotelephone distress signal, used by ships and aircraft.
- French (venez) m'aider (come) help me!