Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lūcŭlentĭtas, ātis, f. [luculentus], excellence, splendor, magnificence: luculentitate captus, Lab. ap. Non. 135, 2 (Com. Rel. v. 71 Rib.): alicujus, Caecil. ib. (Com. Rel. v. 90 Rib.).