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

     

    OS

     abbreviation
    abbreviation
    BrE BrE//ˌəʊ ˈes//
     
    ; NAmE NAmE//ˌoʊ ˈes//
     
     
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  1. 1(computing)operating system
  2. 2ordinary seaman
  3. 3Ordnance Survey
See the Oxford Advanced American Dictionary entry: OS