Lewis & Short

Pammĕnes, is, m., a Greek rhetorician, instructor of Brutus, Cic. Brut. 97, 332; id. Or. 30, 105; id. Att. 5, 20, 2.
Hence, Pammĕnia, ōrum, n., of or belonging to Pammenes: Pammenia illa mihi non placent, those views of Pammenes, Cic. Att. 6, 2, 10.