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English word authentic comes from Ancient Greek αὐθέντης, and later Latin authenticus (Original, genuine, authentic.)
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αὐθέντης (Ancient Greek)
αὐθεντικός (Ancient Greek)
authenticus (Latin)
Original, genuine, authentic.
autentique (Old French)
authentik (Middle English)
authentic (English)
(music, of a Gregorian mode) Having the final as the lowest note of the mode.. (obsolete) authoritative. Conforming to reality and therefore worthy of trust, reliance, or belief.. Of the same origin as claimed; genuine.