Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mĕdĭtātīvus, a, um, adj. [meditor], meditative (post-class.): meditativa verba, which signify a desire to perform an action, also called desiderativa (as lecturio, etc.), Diom. p. 336 P.; Prisc. 825 ib.