cislunar

adjective

cis·​lu·​nar (ˌ)sis-ˈlü-nər How to pronounce cislunar (audio)
: lying between the earth and the moon or the moon's orbit
cislunar space

Examples of cislunar in a Sentence

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.
Lunar ice deposits are critical for making rocket fuel and breathable oxygen to jumpstart the cislunar economy and forge a path to Mars. John Kross, Space.com, 3 Feb. 2025 The agency had long maintained that the space program would benefit from having a presence in cislunar space—the area between the Earth and the moon—to test technologies for future missions to Mars and beyond. IEEE Spectrum, 8 July 2019 These programs could spur commercial space players to redouble their efforts to develop and monetize cislunar space and the lunar surface. John Kross, Space.com, 3 Feb. 2025 The spacecraft will be able to transport payloads to geostationary orbit, cislunar orbit (orbits close to and around the moon) and even interplanetary orbits, according to a Blue Origin description. Josh Dinner, Space.com, 16 Jan. 2025 The contract also includes a cislunar transporter and one uncrewed lunar landing demonstration. Jamie Carter, Forbes, 16 Jan. 2025 The rocket will launch four NASA astronauts into space to begin a journey around the far side of the Moon on the Artemis II mission, the first flight of humans to cislunar space since the last Apollo mission in 1972. Stephen Clark, Ars Technica, 19 July 2024 That's enough to move from higher orbits to cislunar space and back. Eric Berger, Ars Technica, 30 Apr. 2024 Where will Coordinated Lunar Time be used? LTC will be used in operations in cislunar space, the region around the Earth that extends to the moon and past its orbit. George Petras, USA TODAY, 23 Apr. 2024

Word History

First Known Use

circa 1877, in the meaning defined above

Time Traveler
The first known use of cislunar was circa 1877

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Cite this Entry

“Cislunar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cislunar. Accessed 27 Feb. 2025.

Kids Definition

cislunar

adjective
cis·​lu·​nar (ˈ)sis-ˈlü-nər How to pronounce cislunar (audio)
: lying between the earth and the moon or the moon's orbit
Last Updated: - Updated example sentences
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