Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
admissum, i, n. [admitto], a wrong done, a trespass, fault, crime: judicia, quae etiam nullo admisso consequi possent, Cic. Part. Or. 35: tale admissum, Liv. 25, 23: de admissis Poppeae, Tac. A. 11, 4; cf. admitto, II. C.