intercolumnation

Every fourth intercolumnation is filled up with an ornamental niche (if the term be allowable for a recess of the size) to hide the supports behind.

Bell's Cathedrals: The Cathedral Church of Saint Paul An Account of the Old and New Buildings with a Short Historical Sketch Arthur Dimock

Upon these slender data we proceeded, first, to investigate the foundations of the columns towards the west end; and having ascertained the distance of one from the south wall, the width of the south aisle, and consequently of the north, followed of course; another digging immediately to the north ascertained the width of the middle aisle, and a third, from east to west, gave one intercolumnation; the length of the nave being already given by the remains of the transept, the number of columns was now proved.

Traditions of Lancashire, Volume 1 (of 2) John Roby 1821