The strength of a solution; number of molecules of a substance in a given volume.

Roget 72: assemblage; collection, collocation, colligation^†; compilation, levy, gathering, ingathering, muster, attroupement^†; team; concourse, conflux^†, congregation, contesseration^†, convergence etc. 290; meeting, levee, reunion, drawing room, at home; conversazione [It] etc. (social gathering) 892; assembly, congress; convention, conventicle; gemote^†; conclave etc. (council) 696; posse, posse comitatus [Lat.]; Noah's ark.    miscellany, collectanea^†; museum, menagerie etc. (store) 636; 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 [U.S.]; remuda^†; roundup [U.S.]; array, bevy, galaxy; corps, company, troop, troupe, task force; army, regiment etc. (combatants) 726; host etc. (multitude) 102; populousness.    clan, brotherhood, fraternity, sorority, association etc. (party) 712.    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 [Lat.], gavel, hattock^†, stook^†.    accumulation etc. (store) 636; congeries, heap, lump, pile, rouleau^†, tissue, mass, pyramid; bing^†; drift; snowball, snowdrift; acervation^†, cumulation; glomeration^†, agglomeration; conglobation^†; conglomeration, conglomerate; coacervate [Chem], coacervation [Chem], coagmentation^†, aggregation, concentration, congestion, omnium gaterum [Lat.], spicilegium^†, black hole of Calcutta; quantity etc. (greatness) 31.    collector, gatherer; whip, whipper in.    ... show more

Roget 222: centrality, centricalness^†, center; middle etc. 68; focus etc. 74.    core, kernel; nucleus, nucleolus; heart, pole axis, bull's eye; nave, navel; umbilicus, backbone, marrow, pith; vertebra, vertebral column; hotbed; concentration etc. (convergence) 290; centralization; symmetry.    center of gravity, center of pressure, center of percussion, center of oscillation, center of buoyancy &c.; metacenter^†.    ... show more

Roget 290: convergence, confluence, concourse, conflux^†, congress, concurrence, concentration; convergency; appulse^†, meeting; corradiation^†.    assemblage etc. 72; resort etc. (focus) 74; asymptote.    ... show more

Dutch: concentratie
Polish: ścięcie się, stężenie

The spatial property of being crowded together.

synonyms: compactness, denseness, density, tightness.

Polish: zagęszczenie

Strengthening the concentration (as of a solute in a mixture) by removing diluting material.

Increase in density.

Complete attention; intense mental effort.

synonyms: absorption, engrossment, immersion.

Polish: skupienie, koncentracja

Bringing together military forces.

Great and constant diligence and attention.

synonyms: assiduity, assiduousness.

Dutch: ijver, acht, alertheid, applicatie, inzet, oplettendheid, overgave, toewijding