Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* campĭ-cursĭo (better as two words), ōnis, f. [campus], military exercise in the Campus Martius, Veg. Mil. 3, 4 (in Suet. Ner. 7, and id. Galb. 6, called decursio).