To form an appendix or appendage; to attach or append something as a supplement.
From Latin appendicatus, past participle of appendicare (to provide with appendages), derived from appendix. The verb form was created to describe the action of providing something with an appendix or appendage.
This verb is so technical that most dictionaries never bother with it—yet it perfectly describes what editors do when they add footnotes or appendices to a book. Technical vocabularies often include words that practical people create but never use!
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