ar·range / əˈrānj/ • v. [tr.] 1. put (things) in a neat, attractive, or required order: she had just finished arranging the flowers.2. organize or make plans for (a future event): they hoped to arrange a meeting. ∎  [intr.] reach agreement about an action or event in advance: I arranged with my boss to have the time off. ∎  ensure that (something) is done or provided by organizing it in advance: accommodations can be arranged if required.3. Mus. adapt (a composition) for performance with instruments or voices other than those originally specified: songs arranged for viola and piano.DERIVATIVES: ar·range·a·ble adj.ar·rang·er n.

arrange XIV. — OF. arangier, arengier (mod. arranger), f. a- AD- + rangier RANGE.
So arrangement XVIII.