Is “Disquisition” a Scrabble word?
Yes
DISQUISITION
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Disquisition
/ˌdɪskwɪˈzɪʃ(ə)n/
noun
1.A methodical inquiry or investigation.
2.A lengthy, formal discourse that analyses or explains some topic; a dissertation or treatise.