A series of arches and supporting columns, or the architectural technique of constructing such structures; can also mean the action of creating arcades.
From arcade + -ing suffix. The -ing form transforms the noun into both a gerund (the action) and a concrete noun (the architectural feature itself).
Arcading as an architectural technique is practical genius—it solved the problem of creating long covered spaces without needing massive roof supports, and it's why you still see arcades in European towns that are hundreds of years old.
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