Rabbinate is rulership just as it refers to the minister of the cooks as "Rav Tabachaya" the word "Rav" does not exist in Hebrew, it is an Aramaic word minister in Hebrew is "Rav" in Aramaic so regarding a scholar we say "Rav" so and so which means minister so and so meaning- he's a minister of Torah but the word Rav relates to a general rulership regarding this it is said: 