Relating to or occurring every two thousand years, or relating to a period spanning two millennia.
From Latin 'bi-' (two) + 'mille' (thousand) + '-ennium' (year, century) + '-al' (relating to). A variation of bimillenary emphasizing the cyclical or generational aspect over a 2,000-year span.
This word barely exists in everyday use, but it perfectly captures something huge: if you're thinking about bimillenial patterns, you're thinking on a timescale that dwarfs human civilization as we know it!
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