Meaning of Platonic year

Platon'ic year'

Pronunciation: [key]
— Astron. Astron.
  1. a period of about 26,000 years, equal to the time required for a complete revolution of the equinoxes. Also calledCf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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