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Definition of CIS abbreviation from the Oxford Advanced Learner's Dictionary

CIS

abbreviation
 
/ˌsiː aɪ ˈes/
 
/ˌsiː aɪ ˈes/
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  1. Commonwealth of Independent States
    (a group of independent countries that were part of the Soviet Union until 1991)
See CIS in the Oxford Advanced American Dictionary

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