(A name of) the mainly sceptic school of philosophy developed in the 3rd cent. b.c. by Arcesilaus (316/15–242/1 b.c.) when he was head of the Academy founded by Plato.
Mid 17th century; earliest use found in Thomas Stanley (1625–1678), poet and classical scholar. From middle + academy, after Hellenistic Greek Ἀκαδήμεια μέση.