verb (used with object), concentrated, concentrating.
to bring or draw to a common center or point of union; converge; direct toward one point; focus: to concentrate one's attention on a problem; to concentrate the rays of the sun with a lens.
to put or bring into a single place, group, etc.: The nation's wealth had been concentrated in a few families.
to intensify; make denser, stronger, or purer, especially by the removal or reduction of liquid: to concentrate fruit juice; to concentrate a sauce by boiling it down.
Mining. to separate (metal or ore) from rock, sand, etc., so as to improve the quality of the valuable portion.
verb (used without object), concentrated, concentrating.
to bring all efforts, faculties, activities, etc., to bear on one thing or activity (often followed by on or upon ): to concentrate on solving a problem.
to come to or toward a common center; converge; collect: The population concentrated in one part of the city.
to become more intense, stronger, or purer.
a concentrated form of something; a product of concentration: a juice concentrate.

1630–40; concentr(ic) + -ate2; compare French concentrer, Italian concentrare

concentrative [kon-suhn-trey-tiv, kuhn-sen-truh-] , adjective
concentrativeness, noun
concentrator, noun
nonconcentrative, adjective
nonconcentrativeness, noun
overconcentrate, verb, overconcentrated, overconcentrating.
preconcentrate, noun, verb, preconcentrated, preconcentrating.
reconcentrate, verb, reconcentrated, reconcentrating.
unconcentrative, adjective

1. See contract.

1. dissipate, disperse. 5. diverge. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
concentrate (ˈkɒnsənˌtreɪt)
vb (often foll by on)
1.  to come or cause to come to a single purpose or aim: to concentrate one's hopes on winning
2.  to make or become denser or purer by the removal of certain elements, esp the solvent of a solution
3.  (tr) to remove rock or sand from (an ore) to make it purer
4.  to bring one's faculties to bear (on); think intensely (about)
5.  a concentrated material or solution: tomato concentrate
[C17: back formation from concentration, ultimately from Latin com- same + centrumcentre]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1640, from concenter (1591), from It. concentrare, from L. com- "together" + centrum "center" (see center). Originally "to bring or come to a common center;" sense of "mental focus" is mid-19c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The company said it would attempt to sell the concentrate business.
Sometimes the audio would cut out as well, which made it harder for them to
Environmentalists have long said the world should concentrate on preventing
  climate change, not adapting to it.
The mountains concentrate the fumes and noise from all these vehicles.
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