Longman Dictionary of Contemporary English homepage

incumbent

2 adjective
     
incumbent2 formal
1

it is incumbent upon/on somebody to do something

if it is incumbent upon you to do something, it is your duty or responsibility to do it:
It is incumbent upon parents to control what their children watch on TV.
2

the incumbent president/priest/government etc

PGO the president etc at the present time
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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