Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. succensĭo, ōnis, f. [succendo], a setting on fire, kindling (late Lat.): lavacri, i. e. a heating, Amm. 31, 1, 2: prunarum nimia, id. 25, 10, 13: matutina succensio, Tert. Res. Carn. 12.
* 2. succensĭo, ōnis, f. [succenseo], anger, irritation, indignation: memoriam succensionis obliterare, Symm. Ep. 5, 35.