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great year

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noun Astronomy.
  1. Platonic year.
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Origin of great year

First recorded in 1905–10

Great Year

noun
  1. Magnus Annus.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for great year

great year

noun
  1. one complete cycle of the precession of the equinoxes; about 25 800 years
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012