authentic-, authent-

(Greek authentikos > Latin authenticus: original, genuine, authoritative; one who does something himself or herself)

authentic (adjective), more authentic, most authentic
1. A reference to being worthy of acceptance , trust, belief, or reliability: The driver gave an authentic explanation to the mechanic of why he had an accident with his car.
2. Etymology: from 1340, "authoritative", from Old French autentique, from Medieval Latin authenticus, from Greek authentikosl "original oe genuine."

Originally from Greek authentikos, it was a derivative of the noun authentes, "doer, master", which was formed from autos, "self" and the base -hentes, "worker, doer, being".

authenticate (aw THEN ti kayt") (verb), authenticates; authenticated; authenticating
1. To verify or to prove one’s identity: Before Jane could check her e-mails, she first had to authenticate her e-mail address and password.

Before he could pick up his package at the post office, Jeffery had to authenticate that he was the authorized person by showing his driver’s license.

2. To prove something to be genuine; especially, some artistic piece of work: The insurance company wanted Linda to have her violin's condition authenticated by a violin expert so it could be insured in case of theft, fire, etc.
inauthentic, inauthenticity
Intended to deceive; not genuine.
1. Not genuine; a fake.
2. Intended to deceive; counterfeit.
1. Not authenticated.
2. Not made certain by an authority.