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In architecture, the space between columns that support an arch or entablature. Classical, Renaissance, and Baroque architecture used a system codified by Vitruvius in which the measurement is expressed in terms of the columns' diameters (e.g., two columns might be described as being three diameters apart). The system conveniently expressed the measurement of a unit of space whose size varied from building to building according to the Classical order used.
This entry comes from Encyclopædia Britannica Concise. For the full entry on intercolumniation, visit Britannica.com.