Describing a building or colonnade that has 12 columns across its front.
From Latin 'duodecim' (twelve) + Greek 'stylos' (column). The term combines the Latin number prefix with the Greek architectural term. It was used in classical architecture to describe the specific arrangement of support columns.
Ancient architects had a whole vocabulary just for counting columns! A duodecastyle building was considered perfectly balanced and was often used for important temples and public buildings. The Romans loved 12-column designs because they're mathematically versatile and visually striking.
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