Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
2. centŭrĭo (in many inscriptions before the time of Quintilian erroneously aspirated chenturio, like choronae, praechones, etc., Quint. 1, 5, 20; cf. the letter C), ōnis, m. (access. form centŭrĭōnus, like curionus and decurionus, acc. to Fest. p. 49 Müll.) [centuria, II.], the commander of a century, a captain, centurion, occupying a station below the tribunus, Caes. B. G. 1, 40; 2, 25; 6, 39; Cic. Balb. 15, 34; Sall. J. 59, 3; Liv. 2, 27, 6; 7, 41, 5; Hor. S. 1, 6, 73; cf. Dict. of Antiq.