Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lītĭgātĭo, ōnis, f. [litigo], a dispute, quarrel (post-class. for lis, jurgium, certatio): omissis litigationibus (al. litigatoribus), Lact. 3, 8 init. dub. (al. litigatoribus): litigatio μάχη ἡ διὰ λόγων, Gloss. Philox.