annual variation


Definition of annual variation

: the yearly change in a star's mean right ascension or declination produced by precession of the equinoxes and proper motion of the star

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of annual variation

1760, in the meaning defined above

Learn More About annual variation

Time Traveler for annual variation

Time Traveler

The first known use of annual variation was in 1760

See more words from the same year

Dictionary Entries Near annual variation

annual sage

annual variation

annual wage

See More Nearby Entries 

Statistics for annual variation

Cite this Entry

“Annual variation.” Dictionary, Merriam-Webster, Accessed 27 Jun. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!