Definition of mandatory adjective from the Oxford Advanced American Dictionary

     

    mandatory

     adjective
    adjective
    NAmE//ˈmændəˌtɔri//
     
    (formal)
     
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  1. 1required by law synonym compulsory
  2. 2 The offense carries a mandatory life sentence. mandatory (for somebody) (to do something) It is mandatory for blood banks to test all donated blood for the virus.
See the Oxford Advanced Learner's Dictionary entry: mandatory