Learner's definition of AUTHENTIC
1 : real or genuine: not copied or false
We saw authentic examples of ancient Roman sculpture.
The document is authentic.
Experts have confirmed that the signature on the letter is authentic.
3 [more authentic; most authentic] : made to be or look just like an original
The actors were dressed in authentic medieval costumes. [=costumes that looked just like real medieval clothes]
She prepared a very authentic Mexican meal.
The building is an authentic reproduction of a colonial farmhouse.