Percognosco, percognoscis, pereognóui, pen. pro. percognitum, pen. cor. percognoscere. Plau. To know throughly and p sitely.Genania multis postea annis nec tota percognita est. Pli.
Lewis and Short: Latin dictionary
per-cognosco, nōvi, nĭtum, 3, v. a., to become perfectly acquainted with: aliquem, Plaut. Truc. 1, 2, 50 (Speng. pergnovi).— Hence, percognĭtus, a, um, P. a., well known: lex naturae non ignota, etsi nondum percognita, Plin. 2, 45, 45, 116: Germania, id. 4, 14, 28, 98; 37, 3, 11, 45.