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Definition of: sputnik
(sp
t′nik, sput′-) noun
A Russian artificial earth satellite: the first to be recorded in world history, called Sputnik I, containing various scientific instruments, was launched October 4, 1957, to an initial height of 560 miles, orbiting at a mean velocity of 18,000 miles per hour. [<Russian, a satellite; lit., that which travels with something else]
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