Definition of authenticity noun from the Oxford Advanced American Dictionary

 

authenticity

 noun
noun
NAmE//ˌɔθɛnˈtɪsət̮i//
 
[uncountable]
 
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the quality of being genuine or true The authenticity of the letter is beyond doubt. A guard checked the ID card's authenticity, and then activated the electronic turnstile.
See the Oxford Advanced Learner's Dictionary entry: authenticity