Definition of actionist in English:

actionist

noun

  • 1A person who believes in or advocates action; a person who takes action.

  • 2Art
    Art. Also with capital initial. An artist of the actionism movement; specifically (in later use) = Viennese Actionist.

Origin

Early 18th century (in an earlier sense). From action + -ist.

Pronunciation:

actionist

/ˈakʃ(ə)nɪst//ˈakʃənɪst/