Belonging to or attached to something as an accessory; serving as a necessary or natural part of something.
From Old French 'appertenant,' present participle of 'appertenir.' This legal adjective became standard in property and contract language by the 15th century.
When lawyers write 'the barn appurtenant to the property,' they're using medieval French through Latin to avoid any chance of misunderstanding—it's about making language legally bulletproof.
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