authenticity
🇺🇸
/ˌɔːθenˈtɪsəti/
🇬🇧
/ˌɔːθenˈtɪsəti/
the quality of being real, true, or genuine
The museum checked the painting's authenticity to make sure it was real.
博物館檢查了這幅畫的真實性以確保它是真品。