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Definition of
platonic year
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Platonic year
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platonic year
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platonic year
–noun
Astronomy
.
a period of about 26,000 years, equal to the time required for a complete revolution of the equinoxes.
Also called
great year.
Compare
precession of the equinoxes
.
Origin:
1630–40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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