May Day is the 1st of May, which in many countries is celebrated as a public holiday, especially as one in honour of working people.
May Day in British English
noun
a.
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
b.
(as modifier)
May-Day celebrations
May Day in American English
May 1: as a traditional spring festival, often celebrated by dancing around a maypole, crowning a May queen, etc.; as a more recent international labor holiday, observed in many countries by parades, demonstrations, etc.
Examples of 'May Day' in a sentence
May Day
Request armed assistance, ambulance, fire brigade, May Day, May Day, May... `