obligatory
adj.adj. something you must do because of a law, a rule, or a social custom. It is not optional.
adj. required by a legal, moral, or other rule; compulsory. Often describes actions or items that are mandatory within a specific system or social context.
Wearing a seatbelt is obligatory for all passengers.
The company provides an obligatory safety training session for every new employee during their first week.
While the attendance was technically obligatory, the professor noted that true engagement with the material could not be mandated by university policy alone.
From Middle English obligatorie, from Latin obligatōrius.
Often follows a linking verb like 'be' or 'become', or precedes the noun it modifies.
It is obligatory to me to go.It is obligatory for me to go.When specifying the person required to act, use the preposition 'for' rather than 'to'.