1. (geology) lying or leaning on something else
   "an incumbent geological formation"
    
2. Necessary (for someone) as a duty or responsibility; morally binding
   "it is incumbent on them to pay their own debts"
    
3. Currently holding an office
   "the incumbent governor";
   - sitting

1. The official who holds an office
   "The incumbent mayor is running for re-election";
   - officeholder

Derived forms: incumbents

See also: current, necessary, superjacent

Type of: functionary, holder, official

Encyclopedia: Incumbent