"incumbent" in the noun sense
1. incumbent, officeholder
the official who holds an office
"incumbent" in the adjective sense
1. incumbent
lying or leaning on something else
"an incumbent geological formation"
2. incumbent
necessary (for someone) as a duty or responsibility morally binding
"it is incumbent on them to pay their own debts"
3. incumbent
currently holding an office
"the incumbent governor"
Source: WordNet® (An amazing lexical database of English)
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