mutationism
/mjuːˈteɪʃ(ə)nɪz(ə)m/ /mjuːˈteɪʃənɪz(ə)m/Biology. Now historical
noun
The view that mutation, rather than natural selection, is the main driving force in evolution; especially = mutation theory.
Origin
Early 20th century; earliest use found in Mind. From mutation + -ism, after French mutationnisme.