Incumbent?

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incumbent
ɪnˈkʌmb(ə)nt/
adjective
adjective: incumbent
  1. 1.
    necessary for (someone) as a duty or responsibility.
    “the government realized that it was incumbent on them to act”
    synonyms:

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    binding, obligatory, mandatory, necessary, compulsory, required,requisite, essential, imperative

    “it is incumbent on the government to give a clear lead”

    antonyms: optional
  2. 2.
    (of an official or regime) currently holding office.
    “the incumbent President was defeated”
    synonyms: current, existing, present, in office, in power;

    “the incumbent President had been defeated”

    antonyms: past, future
  3. 3.
    (of a company) having a sizeable share of a market.
    “powerful incumbent airlines”
noun
noun: incumbent; plural noun: incumbents
  1. 1.
    the holder of an office or post.
    “the present incumbent will soon be retiring”
    synonyms: holder, bearer, occupant; More

    • CHRISTIAN CHURCH
      the holder of an ecclesiastical benefice.
Origin
late Middle English (as a noun): from Anglo-Latin incumbens, incumbent-, from Latinincumbere ‘lie or lean on’, from in- ‘upon’ +