concenter
American Heritage Dictionary:
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con·cen·ter
(kən-sĕn'tər, kŏn-) 
tr. & intr.v., -tered, -ter·ing, -ters.
To direct toward or come together at a common center.
tr. & intr.v., -tered, -ter·ing, -ters.
To direct toward or come together at a common center.
[Probably Italian concentrare or French concentrer : both from Latin com-, com- + Latin centrum, center; see center.]
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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