1.  arrangement(n = noun.cognition) agreement - the thing arranged or agreed to; "they made arrangements to meet in Chicago"
is a kind of planning, preparation, provision
has particulars: collusion, prearrangement
Derived form verb arrange₂

2.  arrangement(n = noun.group) - an orderly grouping (of things or persons) considered as a unit; the result of arranging; "a flower arrangement"
is a kind of group, grouping
has particulars: floral arrangement, flower arrangement, contrivance, lash-up, scaffold, array, categorisation, categorization, classification, aestivation, estivation, tableau, tableau vivant, venation, vernation, formation, order, ordering, ordination
Derived form verb arrange₅

3.  arrangement(n = noun.cognition) organisation, organization, system - an organized structure for arranging or classifying; "he changed the arrangement of the topics"; "the facts were familiar but it was in the organization of them that he was original"; "he tried to understand their system of classification"
is a kind of structure
has particulars: classification system, contrivance, coordinate system, frame of reference, reference frame, reference system, data structure, design, plan, distribution, statistical distribution, genetic map, kinship system, lattice, living arrangement, ontology, calendar

4.  arrangement(n = noun.attribute) placement - the spatial property of the way in which something is placed; "the arrangement of the furniture"; "the placement of the chairs"
is a kind of position, spatial relation
has particulars: formation, columniation, composing, composition, fenestration, balance, proportion, proportionality, alignment, misalignment, ramification, spacing, spatial arrangement, tandem
Derived form verb arrange₁

5.  arrangement(n = noun.communication) musical arrangement - a piece of music that has been adapted for performance by a particular set of voices or instruments;
is a kind of composition, musical composition, opus, piece, piece of music
has particulars: orchestration, instrumentation

6.  arrangement(n = noun.act) arranging, transcription - the act of arranging and adapting a piece of music;
is a kind of composing, composition
has particulars: rearrangement, instrumentation, orchestration, orchestration

1.  The act of arranging or putting in an orderly condition; the state of being arranged or put in order; disposition in suitable form. [1913 Webster]

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. [1913 Webster]

3.  Preparatory proceeding or measure; preparation; as, we have made arrangement for receiving company. [1913 Webster]

4.  Settlement; adjustment by agreement; as, the parties have made an arrangement between themselves concerning their disputes; a satisfactory arrangement. [1913 Webster]

5.  The adaptation of a composition to voices or instruments for which it was not originally written. [1913 Webster]

arrangement, n.
1 the act or process of arranging or being arranged.
2 the condition of being arranged; the manner in which a thing is arranged.
3 something arranged.
4 (in pl.) plans, measures (make your own arrangements).
5 Mus. a composition arranged for performance by different instruments or voices (see ARRANGE 6a).
6 settlement of a dispute etc.

Etymology:
F (as ARRANGE, -MENT)

N  preparation, providing, provision, providence, anticipation, precaution, preconcertation, predisposition, forecast, rehearsal, note of preparation, arrangement, clearance, adjustment, tuning, equipment, outfit, accouterment, armament, array, ripening, maturation, evolution, elaboration, concoction, digestion, gestation, batching, incubation, sitting, groundwork, first stone, cradle, stepping-stone, foundation, scaffold, scaffolding, echafaudage, training, inurement, novitiate, cooking, cookery, brewing, culinary art, tilling, plowing sowing, semination, cultivation, preparedness, readiness, ripeness, mellowness, maturity, un impromptu fait a loisir, preparer, trainer, pioneer, trailblazer, avant-courrier, avant-coureur, voortrekker, sappers and miners, pavior, navvy, packer, stevedore, warming pan, preparing, in preparation, in course of preparation, in agitation, in embryo, in hand, in train, afoot, afloat, on foot, on the stocks, on the anvil, under consideration, brewing, batching, forthcoming, brooding, in store for, in reserve, precautionary, provident, preparative, preparatory, provisional, inchoate, under revision, preliminary, prepared, in readiness, ready, ready to one's band, ready made, ready cut and dried: made to one's hand, handy, on the table, in gear, in working order, in working gear, snug, in practice, ripe, mature, mellow, pukka, practiced, labored, elaborate, highly-wrought, smelling of the lamp, worked up, in full feather, in best bib and tucker, in harness, at harness, in the saddle, in arms, in battle array, in war paint, up in arms, armed at all points, armed to the teeth, armed cap a pie, sword in hand, booted and spurred, in utrumque paratus, semper paratus, on the alert, at one's post, in preparation, in anticipation of, against, for, abroach, a bove majori discit arare minor, looking before and after, si vis pacem para bellum.

N  order, regularity, uniformity, symmetry, lucidus ordo, music of the spheres, gradation, progression, series, subordination, course, even tenor, routine, method, disposition, arrangement, array, system, economy, discipline orderliness, rank, place, orderly, regular, in order, in trim, in apple-pie order, in its proper place, neat, tidy, en regle, well regulated, correct, methodical, uniform, symmetrical, shipshape, businesslike, systematic, unconfused &c (confuse), arranged, in order, methodically, in turn, in its turn, by steps, step by step, by regular steps, by regular gradations, by regular stages, by regular intervals, seriatim, systematically, by clockwork, gradatim, at stated periods, natura non facit saltum, order is heaven's first law, order from disorder sprung, ordo est parium dispariumque rerum sua loca tribue.

N  arrangement, plan, preparation, disposal, disposition, collocation, allocation, distribution, sorting, assortment, allotment, apportionment, taxis, taxonomy, syntaxis, graduation, organization, grouping, tabulation, analysis, classification, clustering, division, digestion, digest, synopsis, syntagma, table, atlas, file, database, register, organism, architecture, sieve, riddle, screen, sorter, arranged, embattled, in battle array, cut and dried, methodical, orderly, regular, systematic, In vast cumbrous array.

N  pacification, conciliation, reconciliation, reconcilement, shaking of hands, accommodation, arrangement, adjustment, terms, compromise, amnesty, deed of release, peace offering, olive branch, calumet of peace, preliminaries of peace, truce, armistice, suspension of arms, suspension of hostilities, stand-down, breathing time, convention, modus vivendi, flag of truce, white flag, parlementaire, cartel, hollow truce, pax in bello, drawn battle, conciliatory, composing, pacified, requiescat in pace.

N  payment, defrayment, discharge, acquittance, quittance, settlement, clearance, liquidation, satisfaction, reckoning, arrangement, acknowledgment, release, receipt, receipt in full, receipt in full of all demands, voucher, salary, compensation, remuneration (reward), repayment, reimbursement, retribution, pay, money paid, ready money, stake, remittance, installment, payer, liquidator, pay cash, pay cash on the barrelhead, paying, paid, owing nothing, out of debt, all straight, unowed, never indebted, to the tune of, on the nail, money down.

flower arrangement, living arrangement, musical arrangement, spatial arrangement, temporal arrangement