Source : Webster's Revised Unabridged Dictionary (1913)

; equidistant or equally accessible from certain points.

   {Central force} (Math.), a force acting upon a body towards
      or away from a fixed or movable center.

   {Center sun} (Astron.), a name given to a hypothetical body
      about which M["a]dler supposed the solar system together
      with all the stars in the Milky Way, to be revolving. A
      point near Alcyone in the Pleiades was supposed to possess
      characteristics of the position of such a body.