Definitions of arrangement:

• noun:   the act of arranging and adapting a piece of music
• noun:   an organized structure for arranging or classifying

  Example: "He changed the arrangement of the topics"

• noun:   an orderly grouping (of things or persons) considered as a unit; the result of arranging

  Example: "A flower arrangement"

• noun:   the spatial property of the way in which something is placed

  Example: "The arrangement of the furniture"

• noun:   the thing arranged or agreed to

  Example: "They made arrangements to meet in Chicago"

• noun:   a piece of music that has been adapted for performance by a particular set of voices or instruments