The Collaborative International Dictionary of English v.0.48:

Concenter \Con*cen"ter\, Concentre \Con*cen"tre\, v. t.
   To draw or direct to a common center; to bring together at a
   focus or point, as two or more lines; to concentrate.
   [1913 Webster]

         In thee concentering all their precious beams.
                                                  --Milton.
   [1913 Webster]

         All is concentered in a life intense.    --Byren.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Concenter \Con*cen"ter\, Concentre \Con*cen"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

WordNet (r) 3.0 (2006):

concentre
    v 1: bring into focus or alignment; to converge or cause to
         converge; of ideas or emotions [syn: concenter,
         concentre, focalize, focalise, focus]