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English definition of “incumbent”

incumbent

adjective     /ɪnˈkʌmbənt/
be incumbent on/upon sb to do sth formal to be someone's duty or responsibility to do somethingEssential or necessary
[always before noun] holding an official job, especially a political one: the incumbent presidentJobs, careers and professionsWorking
(Definition of incumbent adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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