Definition of "royalist"

A monarchist (supporter of monarchy) or supporter of a particular royal régime.  examples

A legitimist, a supporter of a particular royal line, especially one in danger of being dispossessed of a throne or actually dispossessed of such, and claiming to have the better claim to the throne on the basis of line of descent; especially:

1. (historical) a Cavalier, a supporter of King Charles I of England during the English Civil War.

2. (historical) a supporter of the House of Bourbon, in France since the 18th century and especially during the French Revolution.

3. (historical) a supporter of Ferdinand VII of Spain in Spanish South America during the South American Wars of Independence of the 1810s and 1820s.