antĕ-mĕrīdĭānus, a, um, adj.,
before mid-day or noon : sermo, Cic. de Or. 3, 6: ambulatio, id. ib. 3, 30: litterae, received before mid-day , id. Att. 13, 23.
ante-merīdiānus adj., before mid-day, of the forenoon: sermo: ambulatio. ...
An Elementary Latin Dictionary