antimonarchy
/ˌæntiˈmɒnərki/Definitions
1. noun
Opposition to monarchy, or the principle of opposing or resisting monarchy.
“The antimonarchy movement in the 18th century helped bring about the downfall of the absolute monarchy.”
2. noun
A system or ideology that rejects or opposes monarchical forms of government.
“The antimonarchy regime in the newly formed republic sought to eliminate any reminders of the former monarchy.”