Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prŏpĕrātĭo, ōnis, f. [propero], a hastening, haste, quickness, speediness (rare but class.), Cic. Fam. 5, 12, 2; Q. Cic. ap. Cic. Fam. 16, 27, 1: properationem explorare, Sall. H. 2, 50 Dietsch; Amm. 31, 5, 9.