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

disquisition (plural disquisitions)

1. A methodical inquiry or investigation.
2. A lengthy, formal#Adjective|formal discourse#Noun|discourse that analyses or explains some topic; (loosely) a dissertation or treatise.
   • 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: Printed for A[ndrew] Millar, […]; Edinburgh: A[lexander] Kincaid and J. Bell, OCLC 504648843 ↗, part IV (Of the Effect of Utility upon the Sentiment of Approbation), 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

• French: disquisition
• Italian: disquisizione, dissertazione
• Portuguese: dissertação, tratado
• Russian: тракта́т
• Spanish: disquisición