/ ˌdɪskwɪˈzɪʃn; NAmE / noun
( formal ) a long complicated speech or written report on a particular subject
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WORD ORIGIN
late 15th cent.: via French from Latin disquisitio(n-) investigation, based on quaerere seek. The original sense was topic for investigation , which became discourse in which a subject is investigated (mid 17th cent.).