incumbent
noun /ɪnˈkʌmbənt/
  /ɪnˈkʌmbənt/
- a person who has an official position- the present incumbent of the White House
 Word Originlate Middle English (as a noun): from Anglo-Latin incumbens, incumbent-, from Latin incumbere ‘lie or lean on’, from in- ‘upon’ + a verb related to cubare ‘lie’.