Incumbent
/ˌɪˈnkʌmbənt/
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Definition
(adj) Chiefly followed by on or upon: leaning, or lying, reclining, or resting, on something else.
Sentence Examples
The company was established in 1950 by the incumbent chairman.
It is incumbent on you to do so.
CEFR Practice Quiz
The ____ senator is facing a very tough challenge from a popular young politician this year.