A marginal note, annotation, or commentary added to a text, especially a legal or official document.
From French apostille, derived from Latin post (after) + illa, literally meaning 'that which comes after.' Used particularly in legal contexts to describe endorsements or marginal annotations on documents.
Apostils in international law are how countries verify signatures on official documents—an apostille is a specific official certification that a signature is genuine, named after the marginal notation tradition but now standardized through the Hague Apostille Convention.
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