MANDATORY
Cones from the Magisterium.
late 15th century (denoting a person appointed by a papal mandate): from late Latin mandatarius, from mandatum (see mandate).
. : required by a law or rule : obligatory. the mandatory retirement age. 2. : of, by, relating to, or holding a League of Nations mandate.
"On this page you'll find 42 synonyms, antonyms, and words related to mandatory, such as: binding, compulsory, de rigueur, essential, forced, and imperative."
https://www.thesaurus.com/browse/mandatory#:~:text=On%20this%20page%20you%27ll,essential%2C%20forced%2C%20and%20imperative.