Modernism, in its broadest definition, is modern thought, character, or practice. More specifically, the term describes the modernist movement, its set of cultural tendencies and array of associated cultural movements, originally arising from wide-scale and far-reaching changes to Western society in the late 19th and early 20th centuries. Related terms are modern; modernist; contemporary; postmodern.
Modernism rejected the lingering certainty of Enlightenment thinking and also rejected the existence of a compassionate, all-powerful Creator God.
Modernism was a revolt against the conservative values of realism. Arguably the most paradigmatic motive (motif) of modernism is the rejection of tradition and its reprise, incorporation, rewriting, recapitulation, revision and parody in new forms.
Modernism rejected the lingering certainty of Enlightenment thinking and also rejected the existence of a compassionate, all-powerful Creator God in favor of the abstract, unconventional, largely uncertain ethic brought on by modernity, initiated around the turn of century by rapidly changing technology and further catalyzed by the horrific consequences of World War I on the cultural psyche of artists.