From The Collaborative International Dictionary of English v.0.48 [gcide]:
Acroamatic \Ac'ro*a*mat"ic\, Acroamatical \Ac'ro*a*mat"ic*al\, a. [Gr. ?, fr. ? to hear.] Communicated orally; oral; -- applied to the esoteric teachings of Aristotle, those intended for his genuine disciples, in distinction from his exoteric doctrines, which were adapted to outsiders or the public generally. Hence: Abstruse; profound.
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