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.
ɐn ˈæstɹənˌɔːt fɹʌmðɪ ˈeɪntʃənt ɡɹˈiːk, mˈiːnɪŋ stˈɑːɹ, ænd, mˈiːnɪŋ sˈeɪlɚ ɪz ɐ pˈɜːsən tɹˈeɪnd, ɪkwˈɪpt, ænd dᵻplˈɔɪd baɪ ɐ hjˈuːmən spˈeɪsflaɪt pɹˈoʊɡɹæm tə sˈɜːv æz ɐ kəmˈændɚ ɔːɹ kɹˈuː mˈɛmbɚɹ ɐbˈoːɹd ɐ spˈeɪskɹæft.