cosmonaut

noun

cos·​mo·​naut ˈkäz-mə-ˌnȯt How to pronounce cosmonaut (audio)
-ˌnät
: an astronaut of the Soviet or Russian space program

Examples of cosmonaut 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.
The crew of international astronauts selected for the mission also includes NASA pilot Nichole Ayers and two mission specialists from other space agencies: Japanese astronaut Takuya Onishi of the Japan Aerospace Exploration Agency (Jaxa) and Roscosmos cosmonaut Kirill Peskov. Eric Lagatta, USA TODAY, 18 Mar. 2025 On Sunday, Williams, Wilmore, Hague and Gorbunov welcomed the incoming crew — NASA astronauts Anne McClain and Nichole Ayers, Japanese astronaut Takuya Onishi, and Russian cosmonaut Kirill Peskov — to the orbiting outpost. Denise Chow, NBC News, 18 Mar. 2025 Hague, the Crew 9 commander, arrived at the station last September aboard a SpaceX Crew Dragon capsule along with cosmonaut Alexander Gorbunov. Amanda Castro, Newsweek, 18 Mar. 2025 This would be the first all-female flight crew since Soviet cosmonaut Valentina Tereshkova’s solo spaceflight in 1963. Michelle Lee, People.com, 2 Apr. 2025 See All Example Sentences for cosmonaut

Word History

Etymology

Russian kosmonavt, from Greek kosmos + Russian -navt (as in aeronavt aeronaut)

First Known Use

1955, in the meaning defined above

Time Traveler
The first known use of cosmonaut was in 1955

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Cite this Entry

“Cosmonaut.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cosmonaut. Accessed 24 Apr. 2025.

Kids Definition

cosmonaut

noun
cos·​mo·​naut ˈkäz-mə-ˌnȯt How to pronounce cosmonaut (audio)
-ˌnät
: a Soviet or Russian astronaut

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