To make known or reveal; to apprise or inform someone of something.
Variant or related form to 'apprise,' from Old French 'apprendre' (to learn, inform). The form 'appertise' is extremely rare and may represent a blend or variant of 'apprise' with Latin-based prefixes.
This is basically a ghost word in English—it's so rare that most dictionaries don't include it, but it appears in some 16th-17th century texts as a variant of 'apprise.' It shows how English had multiple competing words before standardization.
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