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Meaning of Magnus Annus*

Mag•nus An•nus

Pronunciation: (mäg'noos än'noos), [key]
— Latin. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.