Definition of: incumbent

(in·kum′bənt) adjective
1. Resting upon one as a moral obligation, or as necessary under the circumstances; obligatory.
2. Resting, leaning, or weighing wholly or partly upon something.
—noun One who holds an office or performs official duties. [<L incumbens, -entis, ppr. of incumbere recline <in- on + cubare lie down]