/ ɔːˈθentɪk; NAmE / adjective
1.
known to be real and genuine and not a copy
OPP inauthentic :
I don't know if the painting is authentic.
2.
true and accurate
OPP inauthentic :
an authentic account of life in the desert
the authentic voice of young black Americans
3.
made to be exactly the same as the original :
an authentic model of the ancient town
► au·then·tic·al·ly / -kli; NAmE / adverb :
authentically flavoured Mexican dishes
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WORD ORIGIN
late Middle English : via Old French from late Latin authenticus , from Greek authentikos principal, genuine.