Lewis Short
ācrŏāsis (noun F) = ἀκρόασις: (
* A hearing, a listening to), the discourse delivered before an assembly, public lecture (cf. the use of contio among Eng. and collegium among Germ. scholars, for discourse, etc.): ut eas vel in acroasi audeam legere,in a public lecture,Cic. Att. 15, 17, 2: Callias acroasin fecit,Vitr. 10, 22: plurimas acroases fecit,Suet. Gram. 2 (al. ἀκροάσεις).
Charlton T. Lewis, Charles Short, A Latin Dictionary