Thousand-year-old; also (by extension, loosely) thousands of years old.
[I]t is highly likely that some preachers may have called on millennial frettings for their purposes. The theologian Abbo of Fleury recalled a premillennial sermon in his youth which did precisely this.
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Occurring every thousand years.
a millennial fair
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Occurring at, or relating to, the beginning or end of a millennium.
the millennial generation
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The vocabulary of software engineers, AI researchers, and anyone living in a terminal or on GitHub — from LLM to MCP, CORS to vibe coding, agentic to enshittification.
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