Main Entry: ul·tra·ism

Pronunciation: \ˈəl-trə-ˌi-zəm\

Function: noun

Date: 1821

1 : the principles of those who advocate extreme measures (as radicalism)
2 : an instance or example of radicalism

— ul·tra·ist \-trə-ist\ adjective or noun

— ul·tra·is·tic \ˌəl-trə-ˈis-tik\ adjective