Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
partĭtūdo, ĭnis, f. [pario], a bearing, bringing forth young, parturition (ante-and post-class.): propinqua partitudo, Plaut. Aul. 1, 1, 36; 2, 3, 9 (both passages cited ap. Non. 217, 28 and 30); Cod. Th. 9, 42, 10; Sulp. Sev. Chron. 1, 9, 3.