›[before noun]holding a particular position in a company, industry, etc. at the present time: the incumbent management/director/supplier
›[before noun]POLITICSholding a particular elected position at the present time: the incumbent mayor/president/vice-president
it is incumbent on sb to do sth›someone has a duty or responsibility to do something: "I think it is incumbent on us to provide a good environment for business," he said.