actionism
/ˈakʃ(ə)nɪz(ə)m/ /ˈakʃənɪz(ə)m/noun
1Belief in or advocacy of taking action; activism.
2 Art. Also with capital initial. An artistic movement emphasizing the physical act or process of creation over the finished work; specifically (in later use) = Viennese Actionism.
Origin
Late 19th century (in an earlier sense). From action + -ism.