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

 

the Mercury program

 
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; NAmE
 
(also Project Mercury)
BrE
 
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the US space programme (1961-63) to put a man into orbit (= circular path in space) around the earth. This was achieved when John Glenn became the first person to go into orbit on 20 February 1962. see also Alan Shepard