observance - definition and synonyms

noun 

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/əbˈzɜː(r)v(ə)ns/
singularobservance
pluralobservances
  1. 1
    [uncountable] the practice of obeying a law or rule, or of doing something according to a tradition
    observance of:

    strict observance of the law

    The markets will be closed in observance of Easter and Passover.