Presidential

google

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late Middle English: via Old French from Latin praesident- ‘sitting before’ (see preside).

wiktionary

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From president +‎ -ial.

etymonline

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presidential (adj.)

c. 1600, "pertaining to a president or presidency," from Medieval Latin praesidentialis, from praesidentia "office of a president" (see presidency). Related: Presidentially.