noun
- a formal discourse or treatise in which a subject is examined and discussed; dissertation.
noun
- a formal written or oral examination of a subject
c.1600, “subject for investigation,” also “systematic search,” from Latin disquisitionem (nominative disquisitio) “an inquiry, investigation,” noun of action from past participle stem of disquirere “inquire,” from dis- “apart” (see dis-) + quaerere “seek, ask” (see query (v.)). Sense of “long speech” first recorded 1640s.