Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A person trained to pilot, navigate, or otherwise participate as a crew member of a spacecraft.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective a person trained to travel in a spacecraft; one who travels in a spacecraft; -- called in the Soviet Union and Russia cosmonaut.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A member of the crew of a spaceship or other spacecraft that travels beyond Earth's atmosphere, or someone trained to serve that purpose

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a person trained to travel in a spacecraft

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[astro– + Greek nautēs, sailor (from naus, ship; see nāu- in Indo-European roots).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Coined from Ancient Greek ἄστρον (ástron, "star") and ναύτης (naútēs, "sailor").

Examples

  • The male TFNGs were learning there was an even more powerful pheromone than jet-jockey wings and the SEAL insignia: the title astronaut.

    Riding Rockets

  • The male TFNGs were learning there was an even more powerful pheromone than jet-jockey wings and the SEAL insignia: the title astronaut.

    Riding Rockets

  • The male TFNGs were learning there was an even more powerful pheromone than jet-jockey wings and the SEAL insignia: the title astronaut.

    Riding Rockets

  • The male TFNGs were learning there was an even more powerful pheromone than jet-jockey wings and the SEAL insignia: the title astronaut.

    Riding Rockets

  • The lower-case-a "astronaut" is someone who has flown in space, either aboard a US spacecraft or who is an American.

    Is Senator Bill Nelson an Astronaut? - NASA Watch

  • At the moment, to be called an astronaut is a claim to significant achievement but we all hope the day will come when it is no more or less impressive than being a sailor or aviator.

    Is Senator Bill Nelson an Astronaut? - NASA Watch

  • Any school visit by an astronaut is of great value and can serve as a life-altering event.

    A Question of Priorities On The 9th Floor - NASA Watch

  • "Any school visit by an astronaut is of great value and can serve as a life-altering event."

    A Question of Priorities On The 9th Floor - NASA Watch

  • Each astronaut is allowed a "bonus food allotment" to bring some of the comforts of home to outer space.

    NASA Watch: March 2009 Archives

  • Still, I am kinda bugged by his statement (specifically having been bumped recently from the ESA Astronaut selection), as this seems to imply that being an astronaut is more down to luck than skill.

    Scott's Excellent Adventure - NASA Watch

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