Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pācĭfĭcātĭo, ōnis, f. [pacifico], a peacemaking, pacification (class.): spes pacificationis, Cic. Att. 7, 8, 4: opem et gratiam alicujus ad pacificationem quaerere, id. ib. 9, 11, 2; id. Fam. 10, 27, 2: ubi ista pacificatio perpetrari nequivit, Gell. 7, 3, 3.