Plural of counterculture; multiple distinct cultures or movements that each oppose mainstream society in their own ways.
From counter- (against) + cultures (plural of culture). The pluralization recognizes that there isn't just one counterculture but many different movements throughout history and across societies that reject the mainstream.
What's fascinating is that every era has multiple countercultures fighting each other too—punk rockers and hippies didn't get along, yet both opposed mainstream culture, showing that 'the alternative' is never just one unified thing.
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