Entry 1 sense Webster, 1913 Catilinarian · Cat·i·li·na·ri·an · IPA /ˌkætɪlɪˈnɛəɹiən/ 01 a. Pertaining to Catiline, the Roman conspirator; resembling Catiline's conspiracy. 1. Pertaining to Catiline, the Roman conspirator; resembling Catiline's conspiracy.