obligatory
US /əˈblɪɡ.ə.tɔːr.i/
UK /əˈblɪɡ.ə.tɔːr.i/

1.
obligatorio, imperativo, forzoso
required by a legal, moral, or other rule; compulsory.
:
•
It is obligatory for all students to wear uniforms.
Es obligatorio para todos los estudiantes usar uniformes.
•
Attendance at the meeting is obligatory for all staff.
La asistencia a la reunión es obligatoria para todo el personal.
2.
obligatorio, formal, de rigor
(of a person or their behavior) done to conform to social or legal requirements rather than from genuine desire or interest.
:
•
He gave an obligatory smile, clearly not amused.
Dio una sonrisa obligatoria, claramente no divertido.
•
The polite applause was merely obligatory.
El aplauso cortés fue meramente obligatorio.