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- DictionaryAs·tro·naut/ˈastrəˌnôt/
noun
- 1. a person who is trained to travel in a spacecraft.
noun
An astronaut (from the Ancient Greek, meaning 'star', and, meaning 'sailor') is a person trained, equipped, and deployed by a human spaceflight program to serve as a commander or crew member aboard a spacecraft. Although generally reserved for professional space travelers, the term is sometimes applied to anyone who travels into space, including scientists, politicians,... Wikipedia