concenter \concen"ter\, concentre \concen"tre\, v. i. imp. 
   p. p. concentered or concentred; p. pr  vb. n.
   concenteringor concentring. f. concentrer, fr. l. con-
   + centrum center. see center, and cf. concentrate
   to come to one point; to meet in, or converge toward, a
   common center; to have a common center.
   1913 webster

         god, in whom all perfections concenter.  --bp.
                                                  beveridge.
   1913 webster concenter
see also:
concentered concentred concentering concentring center concentrate