incumbent

Definitions

Currently holding an office or position.

Necessary for someone as a duty or responsibility.

The holder of an office or post.

Examples

The incumbent president is running for re-election this year.

It is the incumbent duty of every citizen to vote in the local elections.

The incumbent champion successfully defended her title in the final match.

Synonyms

obligatory mandatory binding required necessary compulsory occupant

Antonyms

optional voluntary unnecessary discretionary elective nonessential candidate