Definition of observance noun from the Oxford Advanced American Dictionary

     

    observance

     noun
    noun
    NAmE//əbˈzərvəns//
     
     
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  1. 1[uncountable, singular] the practice of obeying a law, celebrating a festival, or behaving according to a particular custom observance of the law a strict observance of the Sabbath opposite nonobservance
  2. 2[countable, usually plural] an act performed as part of a religious or traditional ceremony religious observances
See the Oxford Advanced Learner's Dictionary entry: observance