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Magnus Annus

[mahg-noo s ahn-noo s]
noun Latin.
  1. the Great Year: a cycle of years, usually a thousand, that begins with a Golden Age, steadily deteriorates, and ends with a universal catastrophe, either a fire or a flood.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018