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.
Instead of trying to build a physical model of planetary interiors from possibly flawed and biased assumptions, the authors generated a series of random models of the interior contents of Uranus and Neptune. Paul Sutter, Space.com, 13 Oct. 2025 The team used global circulation models (GCMs) and computer simulations of entire planetary atmospheres to test this theory. Christopher McFadden, Interesting Engineering, 11 Oct. 2025 The show, held in a crumbling 19th-century villa on the outskirts of the city, was inspired by planetary alignment, archaeological ruins and global unity, says Schnaider, 34. Alexa Brazilian, New York Times, 8 Oct. 2025 The other six planetary health boundaries that have been crossed are climate change, biodiversity loss, freshwater use, biogeochemical flows, land system change and novel entities, which is the safe limit for the production and release of chemicals, plastics and other synthetic substances. Abc Climate Unit, ABC News, 7 Oct. 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 17 Oct. 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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