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Douglas Harper's Etymology Dictionary
loyalism

1812, from loyal + -ism.

Wiktionary
loyalism

n. The property of being a loyalist.

Wikipedia
Loyalism

In general loyalism refers to an individual's allegiance toward an established government, political party, or sovereign, especially during times of war and revolt. The most common usage of the term refers to loyalty to the Great Britain, especially to opponents of the American Revolution and those exiles who went to Canada.

The term loyalist was also used during the Spanish Civil War, applying to Republicans who remained loyal to the Spanish Republic against Franco's "Nationalists."

Usage examples of "loyalism".

Though there were Gamays, Saumurs, Champignys, and Muscadets to choose from, there was only one political vintage allowed at the oaken bar-de Gaulle loyalism.