Definition of passing noun from the Oxford Advanced Learner's Dictionary

      

    passing

     noun
    noun
    BrE BrE//ˈpɑːsɪŋ//
     
    ; NAmE NAmE//ˈpæsɪŋ//
     
    [uncountable] Parliament
     
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  1. 1  the passing of time/the years the process of time going by
  2. 2(formal) the fact of something ending or of somebody dying When the government is finally brought down, no one will mourn its passing. the passing of the old year (= on New Year’s Eve) Many will mourn her passing (= her death, when you do not want to say this directly).
  3. 3  the passing of something the act of making something become a law the passing of a resolution/law See related entries: Parliament
  4. Extra examples Few will mourn his passing. Her death marks the passing of an era. The colour of the wood darkens with the passing of time.Idioms done or said while you are giving your attention to something else synonym casually He only mentioned it in passing and didn't give any details.
See the Oxford Advanced American Dictionary entry: passing