Definitions

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

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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 the GNU version of the Collaborative International Dictionary of English

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

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

  • n. a person trained to travel in a spacecraft

Etymologies

astro- + Greek nautēs, sailor (from naus, ship; see nāu- in Indo-European roots).
(American Heritage® Dictionary of the English Language, Fourth Edition)
Coined from Ancient Greek ἄστρον (ástron, "star") and ναύτης (naútēs, "sailor"). (Wiktionary)

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