What does it mean to be authentic?

For weeks I have been reflecting and reading on what it means to be authentic. The most insightful and helpful resource thus far turned out to be the Stanford Encyclopedia’s entry on Authenticity. While I reject many of the views presented therein (i.e. those embracing postmodernity), I found these too to be tremendously helpful in refining my own views. I also discovered the works of Taylor here and can’t wait for the books to arrive from Amazon.