
Obligatory
Legal Requirements
Used when discussing actions regulated by law or official rules.

Wearing helmets while riding a bike is obligatory in this city.
Not Optional
Implies that there is no choice but to comply with a rule or requirement.

Attendance at the safety training is obligatory for all new employees.
Consequence
Failing to do something obligatory can lead to penalties or negative outcomes.

Submitting a tax return is obligatory and missing the deadline may result in a fine.
Compare with
BindCompulsoryEssentialImperativeIndispensableMandatoryNecessaryPrescribeRequire
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