Disquisition
/ˌdɪskwɪˈzɪʃn/
Definition 1 of 1
Pro Tip 1/3Academic Use
Used mostly in formal academic or intellectual discussions, not casual conversation. 
His disquisition on European politics was published in a scholarly journal.
Pro Tip 2/3Lengthy Text
It usually refers to an extensive or comprehensive written work. 
She spent months preparing her disquisition for the doctoral committee.
Pro Tip 3/3Deep Insight
Implies a deep exploration of a subject, often with expert analysis. 
The professor's disquisition provided new insights into the effects of climate change.