The anniversary of the Battle of Lexington and Concord in the American War of Independence, 19 April 1775, observed since 1894 as a legal holiday in Maine and Massachusetts.
Origin
Late 19th century; earliest use found in The Boston Evening Transcript.
Definition of Patriots' Day in US English:
Patriots' Day
noun
US
The anniversary of the Battle of Lexington and Concord in the American War of Independence, 19 April 1775, observed since 1894 as a legal holiday in Maine and Massachusetts.
Origin
Late 19th century; earliest use found in The Boston Evening Transcript.