1. (n.) The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration.

2. (n.) The act or process of reducing the volume of a liquid, as by evaporation.

3. (n.) 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.

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