| 1 | Latin | authenticus | original, genuine, authentic |
| 2 | Ancient Greek | αὐθεντικός | warranted, authentic, authoritative |
| 3 | Ancient Greek | αὐθέντης | a perpetrator of any act, especially that he... |
| 4 | Ancient Greek | αὐτο- | self- |
| 5 | Ancient Greek | αὐτός | αὐτή f, αὐτό n; "first/second declension";... |
| 6 | Proto-Indo-European | h₂ew | away from, off; again |
| 7 | Proto-Indo-European | ǵʰe | — |