우주선을 타고 우주를 여행하도록 훈련받고 임무를 부여받은 사람.
A person trained, equipped, and assigned to travel in space aboard a spacecraft.
예문:
"The astronaut performed a spacewalk to repair the external solar panel of the station."
"Before becoming an astronaut, she served as a fighter pilot for the air force."
"Only a select few are chosen each year to train as NASA astronauts."