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Definition of outer space noun from the Oxford Advanced Learner's Dictionary

outer space

noun
 
/ˌaʊtə ˈspeɪs/
 
/ˌaʊtər ˈspeɪs/
(also space)
[uncountable]
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  1. the area outside the earth’s atmosphere where all the other planets and stars are
    • radio waves from outer space
    Topics Spacea1
See outer space in the Oxford Advanced American DictionarySee outer space in the Oxford Learner's Dictionary of Academic English

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