1.  collocation(n = noun.communication) - a grouping of words in a sentence;
is a kind of language unit, linguistic unit

2.  collocation(n = noun.act) apposition, juxtaposition - the act of positioning close together (or side by side); "it is the result of the juxtaposition of contrasting colors"
is a kind of emplacement, locating, location, placement, position, positioning
has particulars: tessellation
Derived form verb collocate₂

1.  The act of placing; the state of being placed with something else; disposition in place; arrangement. [1913 Webster]
"The choice and collocation of words." [1913 Webster]

2.  a combination of related words within a sentence that occurs more frequently than would be predicted in a random arrangement of words; a combination of words that occurs with sufficient frequency to be recongizable as a common combination, especially a pair of words that occur adjacent to each other. Also called stable collocation. Combinations of words having intervening words between them, such as verb and object pairs, may also be collocations. [PJC]

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  assemblage, collection, collocation, colligation, compilation, levy, gathering, ingathering, muster, attroupement, team, concourse, conflux, congregation, contesseration, convergence, meeting, levee, reunion, drawing room, at home, conversazione, assembly, congress, convention, conventicle, gemote, conclave, posse, posse comitatus, Noah's ark, miscellany, collectanea, museum, menagerie, museology, crowd, throng, group, flood, rush, deluge, rabble, mob, press, crush, cohue, horde, body, tribe, crew, gang, knot, squad, band, party, swarm, shoal, school, covey, flock, herd, drove, atajo, bunch, drive, force, mulada, remuda, roundup, array, bevy, galaxy, corps, company, troop, troupe, task force, army, regiment, host, populousness, clan, brotherhood, fraternity, sorority, association, volley, shower, storm, cloud, group, cluster, Pleiades, clump, pencil, set, batch, lot, pack, budget, assortment, bunch, parcel, packet, package, bundle, fascine, fasces, bale, seron, seroon, fagot, wisp, truss, tuft, shock, rick, fardel, stack, sheaf, haycock, fascicle, fascicule, fasciculus, gavel, hattock, stook, accumulation, congeries, heap, lump, pile, rouleau, tissue, mass, pyramid, bing, drift, snowball, snowdrift, acervation, cumulation, glomeration, agglomeration, conglobation, conglomeration, conglomerate, coacervate, coacervation, coagmentation, aggregation, concentration, congestion, omnium gaterum, spicilegium, black hole of Calcutta, quantity, collector, gatherer, whip, whipper in, assembled, closely packed, dense, serried, crowded to suffocation, teeming, swarming, populous, as thick as hops, all of a heap, fasciculated cumulative, the plot thickens, acervatim, tibi seris tibi metis.

N  location, localization, lodgment, deposition, reposition, stowage, package, collocation, packing, lading, establishment, settlement, installation, fixation, insertion, habitat, environment, surroundings (situation), circumjacence, anchorage, mooring, encampment, plantation, colony, settlement, cantonment, colonization, domestication, situation, habitation, cohabitation, a local habitation and a name, endenization, naturalization, placed, situate, posited, ensconced, imbedded, embosomed, rooted, domesticated, vested in, unremoved, moored, at anchor.