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Definition of atomic adjective from the Oxford Advanced American Dictionary

     

    atomic

     adjective
    adjective
    NAmE//əˈtɑmɪk//
     
    [usually before noun]
     
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  1. 1connected with atoms or an atom atomic structure
  2. 2connected with weapons that use atomic energy the atomic bomb the postwar atomic program
See atomic in the Oxford Advanced Learner's Dictionary