con·clude / kənˈkloōd/ • v. 1. [tr.] bring (something) to an end: they conclude their study with these words | [intr.] we concluded by singing carols. ∎  [intr.] come to an end. ∎  formally and finally settle or arrange (a treaty or agreement).2. arrive at a judgment or opinion by reasoning: the doctors concluded that Esther had suffered a stroke. ∎  say in conclusion: “It's a wicked old world,” she concluded. ∎ with dated decide to do something: I concluded to go without his knowledge.

conclude †enclose, include; bring or come to a close, settlement, decision; infer, prove. XIV. — L. conclūdere, f. CON- + claudere shut (cf. CLOSE).
So conclusion XIV. — (O)F. conclusion or L. conclūsiō, -ōn-, f. conclūdere, conclūs-. conclusive XVI. — late L.