Definition of "arrangement"

arrangement

/əˈɹeɪnd͡ʒmənt/

noun
countable and uncountable, plural arrangements
1. The act of arranging.
2. The manner of being arranged.
3. A collection of things that have been arranged.
4. A particular way in which items are organized.
  Quotations
  The single-imaging optic of the mammalian eye offers some distinct visual advantages. Such lenses can take in photons from a wide range of angles, increasing light sensitivity. They also have high spatial resolution, resolving incoming images in minute detail. It’s therefore not surprising that most cameras mimic this arrangement.
  2013 July-August, Fenella Saunders, “Tiny Lenses See the Big Picture”, in American Scientist
5. (often in the plural) Preparations for some undertaking.
6. An agreement.
7. (music) An adaptation of a piece of music for other instruments, or in another style.