cos·​mo·​naut | \ ˈkäz-mə-ˌnȯt How to pronounce cosmonaut (audio) , -ˌnät\

Definition of cosmonaut

: an astronaut of the Soviet or Russian space program

Examples of cosmonaut in a Sentence

Recent Examples on the Web In 2000, American astronaut Bill Shepherd and two Russian cosmonauts, Yuri Gidzenko and Sergei Krikalev, became the first residents of the international space station., "Today is Saturday, Nov. 2, the 306th day of 2019. There are 59 days left in the year.," 2 Nov. 2019 The pair aren't the first women to walk in space: 12 pioneering astronauts and cosmonauts made that step into the final frontier before them. Aj Willingham, CNN, "A surprise party, Sriracha secrets and some serious twinning," 19 Oct. 2019 The first was Soviet cosmonaut Svetlana Savitskaya. Marcia Dunn, Twin Cities, "World’s 1st female spacewalking team makes history," 18 Oct. 2019 On Friday, Roscosmos tweeted a tribute to the fallen cosmonaut, touting his many achievements. Jennifer Leman, Popular Mechanics, "Alexei Leonov, the First Man to Walk In Space, Has Died," 11 Oct. 2019 Valentina Tereshkova, an early cosmonaut, became the first woman in orbit in 1963. National Geographic, "Countdown to a new era inSpace," 17 June 2019 As a symbol of the party’s seemingly boundless future, the building was named Cité Gagarine, after the Soviet cosmonaut Yuri Gagarin, the first man in space. New York Times, "French Housing Project, Once a Symbol of the Future, Is Now a Tale of the Past," 11 Sep. 2019 Although American Scott Kelly famously spent almost one year in space aboard the ISS, the record for the longest single spaceflight goes to Russian cosmonaut Valeri Polyakov. Dean Regas,, "Top moments in space in the 50 years since Apollo 11 moon landing," 10 July 2019 In 1984, Soviet cosmonaut Svetlana Savitskaya became the first woman to walk in space., "This day in history," 25 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cosmonaut.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of cosmonaut

1955, in the meaning defined above

History and Etymology for cosmonaut

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

Keep scrolling for more

Learn More about cosmonaut

Time Traveler for cosmonaut

Time Traveler

The first known use of cosmonaut was in 1955

See more words from the same year

Statistics for cosmonaut

Last Updated

16 Nov 2019

Cite this Entry

“Cosmonaut.” The Dictionary, Merriam-Webster Inc., Accessed 22 November 2019.

Keep scrolling for more

More Definitions for cosmonaut


How to pronounce cosmonaut (audio)

English Language Learners Definition of cosmonaut

: an astronaut in the space program of Russia or the former Soviet Union


cos·​mo·​naut | \ ˈkäz-mə-ˌnȯt How to pronounce cosmonaut (audio) \

Kids Definition of cosmonaut

: an astronaut in the space program of Russia or the former Soviet Union

Keep scrolling for more

More from Merriam-Webster on cosmonaut

Rhyming Dictionary: Words that rhyme with cosmonaut

Spanish Central: Translation of cosmonaut

Nglish: Translation of cosmonaut for Spanish Speakers Encyclopedia article about cosmonaut

Comments on cosmonaut

What made you want to look up cosmonaut? Please tell us where you read or heard it (including the quote, if possible).


not agreeing with established beliefs

Get Word of the Day daily email!

Test Your Vocabulary

Name that Food Quiz

Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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