incumbent

INCUMBENT noun

[ C ]
 formal uk/ɪnˈkʌmbənt/ us
someone who has an official job, especially a political one

лицо, занимающее должность
the previous incumbent
incumbent adjective uk/ɪnˈkʌmbənt/ us  be incumbent on/upon sb to do sth formal
to be someone's duty or responsibility to do something

быть чьим-либо долгом сделать что-либо [ always before noun ] holding an official job, especially a political one

занимающий пост, действующий
the incumbent president