English to English
1. Having a genuine original or authority, in opposition to that which is false, fictitious, counterfeit, or apocryphal; being what it purports to be; genuine; not of doubtful origin; real; as, an authentic paper or register.
2. conforming to fact and therefore worthy of belief
an authentic account by an eyewitness|reliable information
3. not counterfeit or copied
an authentic signature|a bona fide manuscript|an unquestionable antique|photographs taken in a veritable bull ring
4. An original (book or document).