What is Areopagite?

Legal Definition
A senator, or a judge of the Areopagus. Solon first established the Areopagites; although some say, they were established in the time of Cecrops, (Anno Mundi, 2553,) the year that Aaron, the brother of Moses, died; that Draco abolished the order, and Solon reestablished it. Demosthenes, in his harangue against Aristocrates, before the Areopagus, speaks of the founders of that tribunal as unknown. See Acts of the Apostles, xviii. 34.
-- Bouviers Law Dictionary
Legal Definition
In ancient Greek law. A lawyer or chief judge of the Areopagus in capital matters in Athens; a tribunal so called after a hill or slight eminence, in a street of that city dedicated to Mars, where the court was held in which those judges were wont to sit. Wharton.
-- Black's Law Dictionary