Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ăquilĭānus (Ăquill-), a, um, adj., Aquilian, proceeding from the jurist Aquilius (a friend of Cicero): quod si Aquiliana definitio vera est, Cic. Off. 3, 15, 61.