Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
admissĭōnālis, is, m. [admissio], one who introduced those who came to an audience, an usher of the privy chamber, a seneschal (late Lat.), Lampr. Alex. Sev. 4; Cod. Th. 6, 35, 7 al.