Source : Webster's Revised Unabridged Dictionary (1913)

Center \Cen"ter\, or Centre \Cen"tre\, seal \seal\ . (Gas
   Manuf.)
   A compound hydraulic valve for regulating the passage of the
   gas through a set of purifiers so as to cut out each one in
   turn for the renewal of the lime.

Center \Center\, or Centre \Centre\, punch \punch\ . (Mech.)
   (a) A punch for making indentations or dots in a piece of
       work, as for suspension between lathe centers, etc.
   (b) A punch for punching holes in sheet metal, having a small
       conical center to insure correct locating.

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.

Center \Cen"ter\, Centre \Cen"tre\, v. t.
   1. To place or fix in the center or on a central point.
      --Milton.

   2. To collect to a point; to concentrate.

            Thy joys are centered all in me alone. --Prior.

   3. (Mech.) To form a recess or indentation for the reception
      of a center.

Centre \Cen"tre\, n. & v.
   See {Center}.

Source : WordNet®

Centre
     n 1: a low-lying region in central France
     2: an area that is approximately central within some larger
        region; "it is in the center of town"; "they ran forward
        into the heart of the struggle"; "they were in the eye of
        the storm" [syn: {center}, {middle}, {heart}, {eye}]
     3: a point equidistant from the ends of a line or the
        extremities of a figure [syn: {center}, {midpoint}]
     4: a place where some particular activity is concentrated;
        "they received messages from several centers" [syn: {center}]
     5: the sweet central portion of a piece of candy that is
        enclosed in chocolate or some other covering [syn: {center}]
     6: a cluster of nerve cells governing a specific bodily
        process; "in most people the speech center is in the left
        hemisphere" [syn: {center}, {nerve center}, {nerve centre}]
     7: a building dedicated to a particular activity; "they were
        raising money to build a new center for research" [syn: {center}]