• Magnetic concentrating installation
    Magnetic concentrating installation
  • WordNet 3.6
    • n concentration strengthening the concentration (as of a solute in a mixture) by removing diluting material
    • n concentration bringing together military forces
    • n concentration great and constant diligence and attention
    • n concentration the strength of a solution; number of molecules of a substance in a given volume
    • n concentration the spatial property of being crowded together
    • n concentration complete attention; intense mental effort
    • n concentration increase in density
    • ***

Additional illustrations & photos:

Magnetic concentrator Magnetic concentrator

Webster's Revised Unabridged Dictionary
  • Interesting fact: In the world, the Netherlands has the highest concentration of museums in the world. Just in Amsterdam alone there are 42 museums
    • Concentration The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration. "Concentration of the lunar beams.""Intense concetration of thought."
    • Concentration The act or process of reducing the volume of a liquid, as by evaporation. "The acid acquires a higher degree of concentration ."
    • Concentration (Metal) 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.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Chameleons change their color by dispersing the concentration of pigment in their skin. This is controlled by the autonomic nervous system. Color changes are determined by external factors such as light and temperature as well as emotions. They do not change color to match their background.
    • n concentration The act of concentrating.
    • n concentration The act of collecting or combining into or about a central point; the act of directing or applying to one object; the state of being brought from several or all directions to a common point or center, or into one mass or group: as, the concentration of troops in one place; the concentration of one's energies.
    • n concentration Specifically, the voluntary continuous direction of thought upon an object; close attention.
    • n concentration In chem., the act of increasing the strength of fluids by volatilizing part of their water. The matter to be concentrated must, therefore, be less readily evaporated than water, as sulphuric and phosphoric acids, solutions of alkalis, etc.
    • n concentration In metallurgy, the separation of the metalliferous and valuable portions of the contents of a vein, or mineral deposit of any kind, from the gangue. Bringing the ore into the proper condition of purity for the smelter is generally called dressing, but sometimes the word concentration is used in this sense.
    • n concentration In dynamics, the excess of the value of any quantity at any point in space over its mean value within an infinitesimal sphere described about that point as a center, this excess being divided by one tenth of the square of the radius of the sphere. This is the same as the negative of the result of operating with Laplace's operator upon the quantity. The concentration of the potential of gravity is proportional to the density of the gravitating matter at the point considered.
    • n concentration In biology, specifically, the tendency in descendants to-ward the inheritance of characters at earlier stages of growth than those in which such characters first made their appearance in the ancestors of any given series.
    • n concentration Concentration may be: The reduction of volume by the process of concentrating, as by the evaporation of water from a solution, or the removal of gangue from an ore.
    • n concentration The strength of a solution as increased by concentrating it and as depending on the amount of some dissolved substance contained in a given volume of the solution.
    • n concentration The strength of a solution as depending on the amount of some substance dissolved in a given amount of the solution, simply, and without reference to any process of concentrating it: it may be measured in percentage, or by specific gravity of the solution.
    • n concentration The number of gram-atoms or gram-equivalents or gram-molecules of the dissolved substance, as the case may be, which are contained in unit volume of the solution. The unit volume is commonly the liter, but sometimes the cubic centimeter. A solution containing one gram-molecule, etc., in the liter is called a normal solution; and one containing one tenth of a grammolecule, etc., in the liter is called a decinormal solution, often written 0.1 normal, or solution.
    • n concentration The number of gram-atoms, gram-equivalents, etc., contained in the unit volume, although not in solution, as in case of gases or vapors. In Herbart's pedagogic system, same as absorption 2.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: In a University of Arizona study, rails and armsrests in public buses were found to be contaminated by the highest concentration of bodily fluids.
    • n Concentration act of concentrating: condensation: the keeping of the mind fixed on something
    • ***


  • Bruce Henderson
    Bruce Henderson
    “Concentrate your strengths against your competitor's relative weaknesses.”
  • Amy Alcott
    Amy Alcott
    “Concentrate, play your game, and don't be afraid to win.”
  • Andrew Carnegie
    “Concentration is my motto -- first honesty, then industry, then concentration.”
  • Chris Evert
    Chris Evert
    “Ninety percent of my game is mental. It's my concentration that has gotten me this far.”
  • Lee Iacocca
    “The ability to concentrate and to use time well is everything.”
  • Jack Nicklaus
    Jack Nicklaus
    “My ability to concentrate and work toward that goal has been my greatest asset.”


Webster's Revised Unabridged Dictionary
Cf. F. concentration,
Chambers's Twentieth Century Dictionary
A lengthened form of Concentre.


In literature:

Concentrated essence of energy!
"The Ultimate Weapon" by John Wood Campbell
The British artillery was concentrated in the neighborhood of Hooge and started a bombardment on June 16.
"The Story of the Great War, Volume V (of 12)"
President of Consolidated Pemmican and Allied Concentrates Incorporated.
"Greener Than You Think" by Ward Moore
The shot were red hot, the fire concentrated, and the guns served with cool efficiency.
"The Life of Napoleon Bonaparte" by William Milligan Sloane
In the experiments here referred to, glass lenses were employed to concentrate the rays.
"Fragments of science, V. 1-2" by John Tyndall
The 19th Infantry Brigade was concentrating at Valenciennes.
"1914" by John French, Viscount of Ypres
This called for concentration of force and concentration of purpose.
"A History of Sea Power" by William Oliver Stevens and Allan Westcott
The teacher found an extraordinary concentration of effort to acquire anything the girl desired.
"The Cricket" by Marjorie Cooke
The Egypto-Roman army was ordered to concentrate on the southern shores of the Ambracian Gulf.
"Famous Sea Fights" by John Richard Hale
Suddenly she seemed to sense the concentrated attention of the audience.
"Black Oxen" by Gertrude Franklin Horn Atherton

In poetry:

Oh, memories of an only child,
How strong and rich ye are!
A wealth of concentrated love
That none beside can share.
"Madam Pond," by Lydia Howard Huntley Sigourney
A long, long kiss, a kiss of youth, and love,
And beauty, all concentrating like rays
Into one focus, kindled from above;
Such kisses as belong to early day
"Don Juan: Canto The Second" by Lord George Gordon Byron
COUNSEL. Swiftly fled each honeyed hour
Spent with this unmanly male!
Camberwell became a bow'r,
Peckham an Arcadian Vale,
Breathing concentrated otto!—
An existence … la Watteau.
"Trial" by William Schwenck Gilbert
She ceased, she clasped her hands, nor yet withdrew
Her eye concentred in its piercing view.
“Nay,” said the Prince, “it ill befits those lips
To talk of kingdoms' and of thrones' eclipse!
"Nebuchadnezzar: Canto VI: The Banquet" by Thomas Aird
"Ere I proceed to illustrate
The views of each protesting State
Thus did the beast address me from the pot -
"Please understand I represent
All phases of State discontent;
In me is concentrated all the lot!"
"The Insect" by C J Dennis
These poems do not live: it's a sad diagnosis.
They grew their toes and fingers well enough,
Their little foreheads bulged with concentration.
If they missed out on walking about like people
It wasn't for any lack of mother-love.
"Stillborn" by Sylvia Plath

In news:

Accord on Term ' Concentration Camp '.
With the price of a CXP-SGCON being comparable with existing narrow band concentrators , utilities have an all-in-one solution which is financially justified.
VBOX, Inc.'s Trooper Oxygen Concentrator Receives FDA Approval.
Wave Form custom rug in worsted British wool by Concentric Carpet, 646-234-4481.
EU better off as concentric powers, not US imitation.
Concentric will add LiveOps Platform and applications to its product offering.
LiveOps has formed a strategic alliance with Concentric Cloud Solutions, which has added LiveOps Platform to its Cloud Voice service offerings targeting small and midsized businesses.
Elma Offers New Push-Button Option for Concentric Encoders.
Elma Electronic now offers a push-button option for its concentric encoders.
Attain Consistent Roundness and Concentricity Readings.
Toolholding System for Maximum Concentricity .
Mike Alden was just days removed from the Division I athletic directors' meetings in Dallas, an event with as much concentrated moving-and-shaking energy as any.
Demystify PowerShell, automate tedious systems administration tasks, and improve your IT efficiency with these concentrated nuggets of PowerShell goodness.
MSA has unveiled the Ultima OPIR-5 Detector, an open-path IR gas detector that provides continuous monitoring of combustible gas concentrations at a path length of up to 150 meters (nearly 500 feet).
The new, less concentrated 160 mg per 5 mL liquid acetaminophen for infants has new dosing instructions and may have a new dosing device in the box, such as an oral syringe rather than a dropper.

In science:

We observe a link between the window size of mass concentration and the rate of explosion of the Strichartz norm by revisiting Bourgain’s mass concentration for the L2 -critical nonlinear Schr¨odinger equations.
A remark on the concentration phenomenon for the L^2-critical nonlinear Schrodinger equations
The preceding lemma shows that L2 functions which are band limited to unit scale and lower frequencies and which are mass concentrated at unit scale remain mass concentrated at unit scale for unit time under the linear Schr¨odinger flow.
A remark on the concentration phenomenon for the L^2-critical nonlinear Schrodinger equations
Zeitouni (), and Alon, Krivelevich, and Vu () by applying the concentration of measure technique that the largest eigenvalue is strongly concentrated around its mean.
Wigner random matrices with non-symmetrically distributed entries
Extrapolating the opposite way around, the present large ǫ theory predicts ”residual” (not singular) concentration fluctuations, becoming of the order of the mean concentration as ǫ → 1, due to more and more particle pairs contributing to the fluctuations.
Concentration fluctuations of large Stokes number particles in a one-dimensional random velocity field
Checking the concentration property In this subsection, we verify the concentration property in the definition of (µ, C, K )-type.
The condition number of a randomly perturbed matrix