from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To direct toward or come together at a common center.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. Alternative spelling of concentre.

from the GNU version of the Collaborative International Dictionary of English

  • intransitive v. To come to one point; to meet in, or converge toward, a common center; to have a common center.
  • transitive v. To draw or direct to a common center; to bring together at a focus or point, as two or more lines; to concentrate.

from The Century Dictionary and Cyclopedia

  • To draw or direct to a common center; bring together; concentrate; center; focus.
  • To converge to or meet in a common center; combine or conjoin in one object; center; focus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. bring into focus or alignment; to converge or cause to converge; of ideas or emotions


Probably Italian concentrare or French concentrer : both from Latin com-, com- + Latin centrum, center; see center.
(American Heritage® Dictionary of the English Language, Fourth Edition)
con- +‎ center (Wiktionary)


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