Authenticity is the quality of being real, genuine, or true — not fake, not copied, not put on. You can talk about the authenticity of a painting, a signature, or an old letter: is it the real thing? People also use it for food, music, and places (“the authenticity of this little noodle shop”).

Authenticity is the quality of being real, genuine, or trueAuthenticity是指真實、真確的特質not fake, not copied, not put on不是假的、不是抄來的、也不是裝出來的You can talk about the authenticity of a painting, a signature, or an old letter你可以講一幅畫、一個簽名或一封舊信的authenticityis it the real thing?也就是它是不是真品People also use it for food, music, and places也會用在食物、音樂和地方上("the authenticity of this little noodle shop")（「這家小麵店的authenticity」）

In the last few decades it has stretched further: “be authentic” can mean “be true to yourself, don’t wear a false face.” That later use is common in magazines and self-help talk; it is a bit looser than the older “not a fake object” meaning, though actually both sit on the same idea of not pretending.

In the last few decades it has stretched further過去幾十年，這個字的意思延伸得更廣"be authentic" can mean "be true to yourself, don't wear a false face"「be authentic」可以是指「忠於自己，不要戴假面具」That later use is common in magazines and self-help talk這種後來的用法常見於雜誌和心靈成長類的談話it is a bit looser than the older "not a fake object" meaning比較舊的「不是假貨」意思更鬆散一點though actually both sit on the same idea of not pretending不過其實兩者都建立在「不假裝」這個核心概念上

It is a fairly formal noun; the everyday adjective is authentic.

It is a fairly formal noun這是個相當正式的名詞the everyday adjective is authentic日常用的形容詞是authentic