The quality or state of being authentic, genuine, and real rather than false or imitated.
From 'authentic' + '-ness' (suffix forming abstract nouns). This noun form provides a direct way to discuss the abstract quality of authenticity.
While 'authenticity' is the standard noun, 'authenticness' shows up in older texts and emphasizes the quality more directly—it's the difference between saying 'the authenticity of it' versus 'its authenticness.'
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