From Longman Dictionary of Contemporary Englishdisquisitiondis‧qui‧si‧tion /ˌdɪskwəˈzɪʃən/ noun [countable] formal TCAPa long speech or written report
Examples from the Corpus
disquisition• Various readability formulas are described in the course of interesting disquisitions on readability by Hatt and by McClellan.• For my part, I endured a long disquisition on the Tractarians from a young and opinionated university liberal.• The sermons were stories instead of disquisitions.• Inevitably my entrance was an intrusion on one disquisition or another.Origin disquisition (1600-1700) Latin disquisitio, from disquirere “to try to get information” 