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Platonic year

American  

noun

Astronomy.

  1. a period of about 26,000 years, equal to the time required for a complete revolution of the equinoxes.

Etymology

Origin of Platonic year

First recorded in 1630–40

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

There is a figure of the great Platonic year with a phenix on his hand on the reverse of a medal of Adrian.

From Project Gutenberg

Oh for the revolution of the great Platonic year, that those times might come over again!

From Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.