Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
intrĭbūtĭo, ōnis, f. [intribuo], a contribution (post-class.): ab intributionibus excusari, Dig. 49, 18, 4: patrimonii intributionibus fungi, ib. 50, 1, 22 fin. al.