The Collaborative International Dictionary
Conclusory
Conclusory \Con*clu"so*ry\, a. Conclusive. [R.]
Douglas Harper's Etymology Dictionary
conclusory
1846, "pertaining to a conclusion," from stem of conclusion + -ory. Probably coined because the secondary "decisive" sense had come to predominate in conclusive.
Wiktionary
conclusory
a. 1 Of or pertaining to a conclusion; conclusive. (from 1846 through early 20th century) 2 (context legal English) Offering a conclusion with seriously deficient support in fact or logic; beg the question. (from 1923)