Added 9 October 2026 authenticity /ɑθɛnˈtɪsɪti/ noun Categories: Describing WordsUncommon Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about authenticity at Wordnik → Where our words come from → Undisputed credibility. Related Words: genuinenesslegitimacysinceritytruthfulnessveracitytruthaccuracyreliabilitycredibilityappropriatenessoriginalityvalidity Back to today's word