Definition of mandatory adjective from the Oxford Advanced Learner's Dictionary

 

mandatory

 adjective
adjective
BrE BrE//ˈmændətəri//
 
, also BrE//mænˈdeɪtəri//
 
; NAmE NAmE//ˈmændətɔːri//
 
(formal)
 
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required by law synonym compulsory The offence 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. Word Origin late 15th cent.: from late Latin mandatorius, from Latin mandatum ‘something commanded’.
See the Oxford Advanced American Dictionary entry: mandatory