IPA: /əˈpɔɪnti/
KK: /əˈpɔɪnti/
A person who has been chosen or assigned to a specific job or position.
The appointee will start their new role next week.
Appointee is formed from "appoint" (from Old French *apointier*, meaning to assign or designate) and "-ee" (meaning a person who is the recipient of an action). The word refers to a person who has been assigned or designated to a position or task.
Think of someone who has been 'assigned' ('appoint') to a role, and the '-ee' indicates that this person is the one receiving that assignment.