ˌintə(r)kəˌləmnēˈāshən noun
also in·ter·col·um·na·tion ˌintə(r)ˌkäləmˈnā-
Etymology: Latin intercolumni um intercolumn + English -ation
1.
a. : the clear space between the columns of a series
b. : the distance between the centers of a series of columns measured at the bottom of the shaft
2. : the system of spacing the columns of a colonnade measured in terms of the base diameter of the shafts — see araeostyle , araeosystyle , diastyle , eustyle , pycnostyle , systyle