Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* nĕgantĭa, ae, f. [nego], a denying, a negation: deinde addunt conjunctionum negantiam, sic: Non et hoc est et illud: hoc autem: non igitur illud, Cic. Top. 14, 57 B. and K. (al. negatio).