\In`ter*co*lum`ni*a"tion\, n. (Arch.)
The clear space between two columns, measured at the bottom
of their shafts. --Gwilt.
Note: It is customary to measure the intercolumniation in
      terms of the diameter of the shaft, taken also at the
      bottom. Different words, derived from the Greek, are in
      use to denote certain common proportions. They are:
      {Pycnostyle}, when the intercolumniation is of one and
      a half diameters; {Systyle}, of two diameters;
      {Eustyle}, of two and a quarter diameters; {Diastyle},
      of three diameters; {Ar[ae]ostyle}, of four or more,
      and so great that a wooden architrave has to be used
      instead of stone; {Ar[ae]osystyle}, when the
      intercolumniations are alternately systyle and
      ar[ae]ostyle.