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obligatory (B2)

adjective

Pronunciation: /əˈblɪɡətɔːri/

Required by a legal, moral, or other rule; compulsory.

Attendance at the weekly team meeting is obligatory for all staff members.
For students, completing the final project is an obligatory part of the course.
In many cultures, offering a gift when visiting someone's home is considered an obligatory gesture.

obligatory for (prepositional phrase): required for a specific person or group — "Wearing a helmet is obligatory for all cyclists in this city."
obligatory to (prepositional phrase): required to do something — "It is obligatory to present your ID at the entrance."

Words with a similar meaning to obligatory:

Words with the opposite meaning to obligatory: