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Noun: authenticity  ,o,then'ti-si-tee or ,o-thun'ti-si-tee
  1. The property of being genuine or valid, not being a fake or forgery
    "he hoped his claims would have a semblance of authenticity";
    - genuineness, legitimacy

Derived forms: authenticities

Type of: believability, credibility, credibleness

Encyclopedia: Authenticity