Wikipedia
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Geonim (; ; also transliterated Gaonim- singular Gaon) were the presidents of the two great Babylonian, Talmudic Academies of Sura and Pumbedita, in the Abbasid Caliphate, and were the generally accepted spiritual leaders of the Jewish community worldwide in the early medieval era, in contrast to the Resh Galuta ( Exilarch) who wielded secular authority over the Jews in Islamic lands.
Geonim is the plural of גאון (Gaon') , which means "pride" or "splendor" in Biblical Hebrew and since the 19th century "genius" as in modern Hebrew. As a title of a Babylonian college president it meant something like "His Excellency".
The Geonim played a prominent and decisive role in the transmission and teaching of Torah and Jewish law. They taught Talmud and decided on issues on which no ruling had been rendered during the period of the Talmud. The Geonim were also spiritual leaders of the Jewish community of their time.