Borrowed from French disquisition, from Latin disquīsītiō, from disquīrō ("to investigate") (from dis- + quaerō ("to look for, seek; to inquire, question")) + -tiō.

• (RP) IPA: /ˌdɪskwɪˈzɪʃ(ə)n/
• (America) IPA: /ˌdɪskwəˈzɪʃən/

disquisition (plural disquisitions)

1. A methodical inquiry or investigation.

   Near-synonym: inquisition

   • 1834, L[etitia] E[lizabeth] L[andon], chapter XXV, in Francesca Carrara. […], volume III, London: Richard Bentley, […], (successor to Henry Colburn), →OCLC ↗, page 216 ↗:

     ..."What a feeling of security," continued he, "is flung round the uncertainty of love, by the calm and gentle images with which it is here invested!—" But their disquisition was interrupted by Lord Avonleigh, who came to announce that a deputation from Southampton waited without, full of eloquence and loyalty.

2. A lengthy, formal discourse that analyses or explains some topic; (loosely) a dissertation or treatise.

   Coordinate terms: exposition; analysis

   • 1761, Adam Smith, “Of the Beauty which the Appearance of Utility Bestows upon All the Productions of Art, and of the Extensive Influence of this Species of Beauty”, in The Theory of Moral Sentiments, 2nd edition, London: […] A[ndrew] Millar, […]; Edinburgh: A[lexander] Kincaid and J. Bell, →OCLC ↗, part IV, page 278 ↗:

     Upon this account political diſquiſitions, if juſt, and reasonable, and practicable, are of all the works of ſpeculation the most uſeful.

• disquisitive
• disquisitor
• disquisitorial
• disquisitory

• German: Untersuchung, Auseinandersetzung

• French: disquisition
• German: Abhandlung, Erörterung, Auseinandersetzung
• Italian: disquisizione, dissertazione
• Portuguese: dissertação, tratado
• Russian: тракта́т
• Spanish: disquisición