The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration. [1913 Webster]
"Concentration of the lunar beams." [1913 Webster]

"Intense concetration of thought." [1913 Webster]
The act or process of reducing the volume of a liquid, as by evaporation. [1913 Webster]
"The acid acquires a higher degree of concentration." [1913 Webster]
The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water. [1913 Webster]

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OXFORD DICTIONARY

concentration, n.
1 a the act or power of concentrating (needs to develop concentration). b an instance of this (interrupted my concentration).
2 something concentrated (a concentration of resources).
3 something brought together; a gathering.
4 the weight of substance in a given weight or volume of material.

Idiom

concentration camp a camp for the detention of political prisoners, internees, etc., esp. in Nazi Germany.

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THESAURUS

concentration

abbreviation, absorbed attention, absorption, abstraction, accelerando, acceleration, advertence, advertency, agglutination, aggravation, alertness, application, approach, ardor, assiduity, assiduousness, astriction, astringency, asymptote, attention, attention span, attentiveness, awareness, beefing-up, blowing up, blowup, bottleneck, brown study, bulldog tenacity, care, centering, centralism, centralization, cervix, circumscription, close study, clumping, clustering, coarctation, collision course, compactedness, compaction, compression, compressure, concentralization, concentrate, concourse, concretion, concurrence, condensation, confluence, conflux, congress, consciousness, consideration, consolidation, constancy, constriction, constringency, contemplation, contemplativeness, contraction, contracture, convergence, converging, crossing, curtailment, debate, decoction, decrease, deep study, deep thought, deepening, deliberation, densification, diligence, diminuendo, distillate, distillation, dogged perseverance, doggedness, ear, earnestness, elixir, endurance, energeticalness, energy, engagement, engrossment, enhancement, enthrallment, essence, exacerbation, exaggeration, explosion, expression, extract, extraction, fervor, fidelity, firmness, firmness of mind, fixedness, flintiness, focalization, focus, focusing, funnel, hardening, heating-up, heed, heedfulness, heightening, hourglass, hourglass figure, hub, immersion, indefatigability, industriousness, industry, inflexibility, information explosion, infusion, insistence, insistency, intensification, intentiveness, intentness, involvement, isthmus, knitting, laboriousness, loyalty, magnification, meditation, meeting, melancholy, mindfulness, monomania, musing, mutual approach, narrow place, narrowing, narrowing gap, neck, note, notice, observance, observation, obsession, obstinacy, patience, patience of Job, pensiveness, permanence, perseverance, persistence, persistency, pertinaciousness, pertinacity, pickup, plodding, plugging, pooling, population explosion, preoccupation, pressing, profound thought, puckering, purification, pursing, quintessence, radius, rapt attention, redoubling, reduction, refinement, reflectiveness, regard, regardfulness, reinforcement, relentlessness, remark, rendering, rendition, resolution, respect, reverie, rigidity, sedulity, sedulousness, settledness, shortening, single-mindedness, singleness of purpose, slogging, soaking, solidification, speculativeness, speedup, spirit, spokes, squeezing, stability, stamina, staunchness, staying power, steadfastness, steadiness, steeliness, steeping, step-up, stick-to-itiveness, stranglement, strangulation, strengthening, strenuousness, striction, stricture, stubbornness, studiousness, study, submersion, systole, tangent, tenaciousness, tenacity, thought, thoughtfulness, tightening, tirelessness, trueness, unremittingness, unsparingness, unswerving attention, unyieldingness, vehemence, wasp waist, wistfulness, wrinkling, zealousness

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ROGET THESAURUS

concentration

Assemblage

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.

Centrality

N centrality, centricalness, center, middle, focus, core, kernel, nucleus, nucleolus, heart, pole axis, bull's eye, nave, navel, umbilicus, backbone, marrow, pith, vertebra, vertebral column, hotbed, concentration, centralization, symmetry, center of gravity, center of pressure, center of percussion, center of oscillation, center of buoyancy, metacenter, central, centrical, middle, azygous, axial, focal, umbilical, concentric, middlemost, rachidian, spinal, vertebral, middle, midst, centrally.

Convergence

N convergence, confluence, concourse, conflux, congress, concurrence, concentration, convergency, appulse, meeting, corradiation, assemblage, resort, asymptote, converging, convergent, confluent, concurrent, centripetal, asymptotical, asymptotic, confluxible.

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