To authenticate an official document in accordance with the Apostille Convention.
1.a marginal annotation or note.
1. a marginal note Word OriginC16, from French apostille, from Old French apostiller to make marginal notes, from Medieval Latin postilla, probably from Latin post illa (verba) after those (words)Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollinsPublishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source
"note, especially on text of the Bible," also apostil, 1520s, from French apostille (15c.), probably from Medieval Latin postilla, which probably represents Latin post illa, literally "after those."
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