Definition of momentous adjective from the Oxford Advanced American Dictionary

     

    momentous

     adjective
    adjective
    NAmE//moʊˈmɛntəs//
     
    , NAmE//məˈmɛntəs//
     
     
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  1. 1very important or serious, especially because there may be important results synonym historic
  2. 2 a momentous decision/event/occasion
See the Oxford Advanced Learner's Dictionary entry: momentous