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galactic year

American  

noun

Astronomy.

  1. the duration of a complete rotation of the Milky Way, approximately 200 million years.

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We call the period of the Sun’s revolution the galactic year.

From Textbooks ● Oct. 13, 2016

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.

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