Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
āversātĭo, ōnis, f. [aversor], a turning of one’s self away, aversion (post-Aug. and rare): tacita aversatio, Quint. 8, 3, 65: alienorum processuum, Sen. Tranq. 2 med.