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)