What is defined as a culture within a culture that rejects the parent culture's norms?

The term that denotes a culture within a larger culture that actively rejects and opposes the norms and values of that parent culture is counterculture. This concept is characterized by a group that establishes its own set of beliefs, practices, and ideals that starkly contrast with those of mainstream society.

Countercultures arise in response to dissatisfaction with the dominant culture, often advocating for social or political change, and can encompass various aspects such as lifestyle, clothing, music, and political ideology. The defining feature of counterculture is its oppositional stance, which seeks not merely to exist alongside the majority but to challenge and undermine its values and practices.

Other terms like subculture describe a smaller cultural group within a larger culture that may have distinct values or practices but does not inherently reject the larger culture. Mainstream culture refers to widely accepted beliefs and practices within society, while ethnic culture pertains to the customs and practices of a specific ethnic group, which may coexist harmoniously with the dominant culture rather than oppose it.