incumbent

adjective

• 1 (incumbent on/upon) necessary for (someone) as a duty or responsibility:the government realized that it was incumbent on them to act

• 2 [attributive] (of an official or regime) currently holding office:the incumbent President was defeated

• 3 [attributive] (of a company) having a sizeable share of a market:powerful incumbent airlines

noun

• the holder of an office or post: the present incumbent will soon be retiring
• Christian Church the holder of an ecclesiastical benefice.