Source : Webster's Revised Unabridged Dictionary (1913)

Center \Cen"ter\, Centre \Cen"tre\ v. i. [imp. & p. p.
   {Centered} or {Centred}; p. pr. & vb. n. {Centering} or
   {Centring}.]
   1. To be placed in a center; to be central.

   2. To be collected to a point; to be concentrated; to rest
      on, or gather about, as a center.

            Where there is no visible truth wherein to center,
            error is as wide as men's fancies.    --Dr. H. More.

            Our hopes must center in ourselves alone. --Dryden.

Source : WordNet®

centered
     adj 1: being or placed in the center
     2: concentrated on or clustered around a central point or
        purpose [syn: {centred}, {centralized}, {centralised}, {focused}]