What does arrangement mean?
The definition of arrangement
Ar*range”ment, n.
Etym: [Cf. F. arrangement.]

1 The act of arranging or putting in an orderly condition; the state of being arranged or put in order; disposition in suitable form.
2 The manner or result of arranging; system of parts disposed in due order; regular and systematic classification; as, arrangement of one’s dress; the Linnæan arrangement of plants.
3 Preparatory proceeding or measure; preparation; as, we have made arrangement for receiving company.
4 Settlement; adjustment by agreement; as, the parties have made an arrangement between themselves concerning their disputes; a satisfactory arrangement.
5 (Mus.)

(a) The adaptation of a composition to voices or instruments for which it was not originally written.
(b) A piece so adapted; a transcription; as, a pianoforte arrangement of Beethoven’s symphonies; an orchestral arrangement of a song, an opera, or the like.