Etymology
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Words related to authentic

auto- 
word-forming element meaning "self, one's own, by oneself, of oneself" (and especially, from 1895, "automobile"), from Greek autos, reflexive pronoun, "self, same," which is of unknown origin. It also was a common word-forming element in ancient Greek, as in modern English, but very few of the old words have survived the interval. In Greek, as a word-forming element, auto- had the sense of "self, one's own, of oneself ('independently'); of itself ('natural, native, not made'); just exactly; together with." Before a vowel, it became aut-; before an aspirate, auth-. In Greek it also was used as a prefix to proper names, as in automelinna "Melinna herself." The opposite prefix would be allo-.
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authenticate (v.)
"verify, establish the credibility of," 1650s, from Medieval Latin authenticatus, past participle of authenticare, from Late Latin authenticus (see authentic). Also "render authentic" (1650s). Related: Authenticated; authenticating.
authenticity (n.)
1760, from authentic + -ity. Earlier were authentity (1650s), authenticness (1620s).
effendi (n.)
Turkish title of respect, equivalent to English sir, 1610s, from Turkish efendi, title of respect applied to professionals and officials, corruption of Greek authentes "lord, master" (in Modern Greek aphentes; see authentic).
inauthentic (adj.)
1783, from in- (1) "not, opposite of" + authentic. Related: Inauthentically.