/ ˈmændətəri; NAmE -tɔːri BrE also mænˈdeɪtəri/ adjective
mandatory (for sb) (to do sth) ( formal ) required by law
SYN compulsory :
It is mandatory for blood banks to test all donated blood for the virus.
The offence carries a mandatory life sentence.
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WORD ORIGIN
late 15th cent.: from late Latin mandatorius , from Latin mandatum something commanded.