1. a long or elaborate essay or discussion on a particular subject:"nothing can kill a radio show quicker than a disquisition on intertextual analysis"
Word Originlate 15th century: via French from Latin disquisitio(n-) ‘investigation’, based on quaerere ‘seek’. The original sense was ‘topic for investigation’, whence ‘discourse in which a subject is investigated’ (mid 17th century).