concurring figure

from The Collaborative International Dictionary of English v.0.48

Concurring \Con*cur"ring\, a.
   Agreeing.
   [1913 Webster]

   {Concurring figure} (Geom.), one which, being laid on
      another, exactly meets every part of it, or one which
      corresponds with another in all its parts.
      [1913 Webster]