planetary

adjective

plan·​e·​tary ˈpla-nə-ˌter-ē How to pronounce planetary (audio)
1
a
: of, relating to, being, or resembling a planet
c
: having a motion like that of a planet
planetary electrons
d
: immense
the scope of this project has reached planetary proportions
2
a
: of, relating to, or belonging to the earth : terrestrial
b
: global, worldwide
planetary politics
3
: having or consisting of an epicyclic train of gear wheels

Examples of planetary in a Sentence

a positively planetary new shopping development
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
And humans are uniquely poised to propel this great transition by pushing out from our planetary cradle. Lee Billings, Scientific American, 10 Nov. 2025 Then comes 11/11, and your planetary ruler Jupiter retrogrades into Cancer, in your sector of creativity, romance, and self-expression. Dossé-Via Trenou, Refinery29, 9 Nov. 2025 Their findings show that planets are far less common around stars in this late stage of life, suggesting that many close-orbiting worlds are likely destroyed as their stars expand, offering strong observational evidence of this dramatic planetary demise. Bojan Stojkovski, Interesting Engineering, 8 Nov. 2025 Beginning with almost half a million planetary systems, a team of researchers worked this down to a sample of 15,000 possible planetary signals detected by TESS. Robert Lea, Space.com, 7 Nov. 2025 See All Example Sentences for planetary

Word History

First Known Use

1607, in the meaning defined at sense 1a

Time Traveler
The first known use of planetary was in 1607

Cite this Entry

“Planetary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planetary. Accessed 15 Nov. 2025.

Kids Definition

planetary

adjective
plan·​e·​tary ˈplan-ə-ˌter-ē How to pronounce planetary (audio)
1
a
: of or relating to a planet
b
: having a motion like that of a planet
planetary electrons of the atomic nucleus
2
: worldwide, global
a matter of planetary concern

More from Merriam-Webster on planetary

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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