- The second Monday in March, on which the British Commonwealth is celebrated. It was instituted to commemorate assistance given to Britain by the colonies during the Boer War (1899–1902). Formerly called Empire Day.More example sentences
- There are about 12 holidays in the year, including New Year's Day in January and Commonwealth Day in March.
- On Commonwealth Day the United Kingdom celebrates its membership of the family of Commonwealth nations.
- The Commonwealth message is delivered on Commonwealth Day, usually the second Monday in March.