In a manner relating to architecture, building design, or construction principles; from an architectural perspective.
From architectural + -ly (adverbial suffix). Standard English formation since the 17th century for describing things as they relate to architectural concerns.
Architecturally is what you say when something matters for how it's built—'this is architecturally significant' means the building itself, not just what happens inside, and it shows how architecture influences how we experience the world.
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