authenticity

authentic +‎ -ity

• (US, cot–caught merger) IPA^(key): /ɑθɛnˈtɪsɪti/, /ɑθənˈtɪsɪti/, [ɑθɛnˈtɪsɪɾi], [ɑθənˈtɪsɪɾi]

authenticity (usually uncountable, plural authenticities)

1. The quality of being genuine or not corrupted from the original.

   I hereby certify the authenticity of this copy.

2. Truthfulness of origins, attributions, commitments, sincerity, and intentions.

   The authenticity of this painting is questionable.

   • 2018, James Lambert, “A multitude of ‘lishes’: The nomenclature of hybridity”, in English World-Wide‎, page 2:

     Urban Dictionary records at least 66 of the terms found by the present research, but as this dictionary liberally accepts words, definitions, and sample sentences based solely on the say-so of contributors, in the absence of corroboration from other sources the authenticity of some entries must remain dubious.

3. (obsolete) The quality of being authentic (of established authority).

• (quality of being genuine): genuineness

• (quality of not being genuine): phoniness; forgery; fakeness; bogosity

• authentically
• authenticism

• authenticity on Wikipedia.Wikipedia