Definition of the Gemini program from the Oxford Advanced Learner's Dictionary

 

the Gemini program

 
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a series of US space flights (1963-66) with two men in each. During the Gemini flights astronauts made space 'walks' and brought two spacecraft together in space for the first time. This was a preparation for the Apollo program, and one of the Gemini astronauts was Neil Armstrong, the first man on the moon.