A philosophy or movement based on rejecting established social norms, traditions, and conventional ways of doing things.
From anticonventional + -ism (system or belief). As artistic and social movements sought philosophical grounding in the 20th century, -ism suffix transformed descriptive observations into named ideologies.
Anticonventionalism became a conscious aesthetic and lifestyle choice in modernism, surrealism, and punk rock—but the paradox is that once it becomes systematized as an -ism, it becomes its own convention that people conform to.
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