Top Definition
The former name of Canada Day. Dominion Day is a commemoration day of the granting of national status in various Commonwealth countries. Dominion Day was the name of the holiday commemorating the formation of Canada as a Dominion on 1 July 1867. Dominion Day was changed to Canada Day on October 27th, 1982.
Bob: Happy Dominion Day, eh?
Larry: What decade are you from? It's Canada Day now, eh?
Bob: The name change was stupid. Happy Dominion Day!
by Tout fille Canadian July 01, 2011

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