LEARNit Dictionary

incumbent

noun
1
a person who has an official position
متصدی, مسئول فعلی, دارنده منصب
adjective
1
having an official position
مقام دار, صاحب منصب, دارای مقام رسمی
2
necessary as part of somebody’s duties
واجب, لازم, ضروری, وظیفه‌مند, وظیفه‌ای
It was incumbent on them to attend.