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Platonic year

noun, Astronomy.
1.
a period of about 26,000 years, equal to the time required for a complete revolution of the equinoxes.
Also called great year.
Origin of Platonic year
1630-1640
First recorded in 1630-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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12
16
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