Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
incensio, ōnis, f. [incendo], a setting on fire, burning (rare but class.): Capitolii, Cic. Cat. 3, 4, 9: incensione urbem liberavi, id. Sull. 11, 33: turis, Arn. 7, 234.