incumbency (noun) – the holding of an office, post, or title, usually elected; the period during which an office or post is held
BREAKDOWN: IN- (in) + CUMB- (to lie) + -ENCE (state of being) + -Y (act or state)
— incumbent means currently holding office or alternately imposed on or required of someone as an obligation
— an incumbent is someone who holds a temporary post, office, or title
This word is built on the root CUMB-, which means to lie down.
Common CUMB- words include succumb.
More esoteric CUMB- words include accumbent and procumbent.