A customs house or the customs authority, especially in French-speaking regions.
From French 'douane,' which derives from Italian 'dogana,' ultimately from Arabic 'dīwān' (a government council or tax office), showing medieval trade connections.
The word 'douane' traces a beautiful path through medieval Mediterranean trade—Arabic administrative terms entered Italian as trade flourished, then French, and now appear in English when discussing continental European customs—it's a linguistic record of commerce and cultural contact.
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