incumbent
adjective
[ ɪnˈkʌmb(ə)nt ]
• necessary for (someone) as a duty or responsibility.
• "the government realized that it was incumbent on them to act"
• (of an official or regime) currently holding office.
• "the incumbent President was defeated"
• (of a company) having a sizeable share of a market.
• "powerful incumbent airlines"
incumbent
noun
• the holder of an office or post.
• "the present incumbent will soon be retiring"
Origin:
late Middle English (as a noun): from Anglo-Latin incumbens, incumbent-, from Latin incumbere ‘lie or lean on’, from in- ‘upon’ + a verb related to cubare ‘lie’.
