required by lawsynonymcompulsoryThe 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.Oxford Collocations DictionaryMandatory is used with these nouns: attendance,embargo,evacuation,…Seefull entryWord Originlate 15th cent.: from late Latin mandatorius, from Latin mandatum ‘something commanded’.
See mandatory in the Oxford Learner's Dictionary of Academic EnglishSee mandatory in the Oxford Advanced American Dictionary
