I. adjective Date: 15th century containing or constituting a command ; obligatory , of, by, relating to, or holding a League of Nations mandate, mandatorily adverb II. noun (plural -ries) Date: 1661 one given a mandate
MANDATORY
Meaning of MANDATORY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012