Definition from Wiktionary, the free dictionary
- Honorary title for a Jewish scholar who is noted for his wisdom and knowledge of the Talmud.
- In modern usage, a genius.
- 1991, Joseph Telushkin, Jewish Literacy 
- The Gaon also was distressed by the veneration the Hasidim accorded their rabbinic leaders, men whom the Gaon generally regarded as ignoramuses.
- 1996, Roger Friedland, Richard Hecht, To Rule Jerusalem 
- Like the hasidim, he too refused the title of rabbi, adopting the ancient title of Gaon.
- 1997, Moshe Gil, A History of Palestine 
- The Gaon also mentions a letter he has received from Ḥasan as-ʻĀqūlī (al-ʻĀqūla, the ancient Aramaic name for Kūfa) undoubtedly one of the emigrants from Iraq to Egypt whom the Gaon knew.