Definition of authentic adjective from the Oxford Advanced American Dictionary
authentic
adjective
/ɔˈθɛntɪk/
1known to be real and genuine, and not a copyI don't know if the painting is authentic.antonyminauthentic2true and accuratean authentic account of life in the desertantonyminauthenticthe authentic voice of inner-city youth3made to be exactly the same as the originalan authentic model of the ancient townSet sail on an authentic Tall Ship in Boston harbor!authentically
/‑kli/
adverbauthentically flavored Mexican dishesan authentically constructed Wild West town