Authenticity is a technical term used in psychology as well as existentialist philosophy and aesthetics. In existentialism, authenticity is the degree to which one is true to one's own personality, spirit, or character, despite external pressures; the conscious self is seen as coming to terms with being in a material world and with encountering external forces, pressures and influences which are very different from, and other than, itself. A lack of authenticity is considered in existentialism to be bad faith.
Other articles related to "authenticity":
... concerned with the notion of authenticity despised jazz music because he saw it as a false representation that could give the appearance of authenticitybut that was as much bound up in concerns with appearance ... Heidegger in his later life associated authenticitywith non-technological modes of existence, seeing technology as distorting a more "authentic" relationship with the natural world ... Race relations are seen as another limit on authenticity as they demand that the self engage with others on the basis of external attributes ...