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.
This approach grounds technical excellence in solid understanding of human nature and planetary limits. Cornelia C. Walther, Forbes.com, 9 Sep. 2025 The scientist also outlined China’s vision for a comprehensive planetary defense system that would combine early warning, in-orbit response, and overall preparedness for potential asteroid threats. Bojan Stojkovski, Interesting Engineering, 7 Sep. 2025 Compliments find you with greater ease, too; with Venus, your planetary ruler, now in Leo, your magnetism is louder and your confidence reads as warm, not cocky. Dossé-Via Trenou, Refinery29, 7 Sep. 2025 Even though the comet poses no threat to Earth, the world's astronomers and space agencies are racing to harness a rare opportunity to study planetary material that formed from another star. Eric Lagatta, USA Today, 5 Sep. 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 10 Sep. 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

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