Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ŏpŭlentĭtas, ātis, f. [opulens], wealth, power (ante class.): quasi ejus opulentitatem reverearis, Plaut. Mil. 4, 4, 35: nostra, Caecil. ap. Non. 146, 14.