obligatory
//əˈblɪɡətɔːri//
Adjective
obligatoryCanonical form
more obligatoryComparative
most obligatorySuperlative
1
Required by a law, rule, or duty; compulsory.
Wearing a seatbelt is obligatory for all passengers.
2
So customary or routine as to be expected or unavoidable.
He made the obligatory joke about the weather.