term used to designate an intercolumniation of three or four diameters.[14]
• (n.) See under Intercolumniation.
Di'a·style noun [ Latin diastylus , Greek ...; 
Diastyle is an arrangement of columns in Grecian and Roman architecture in which the inter-columniation or space between the columns is equal to three, or according to some four, diameters of the shaft.
having an intercolumniation of three diameters. See illus. under