While it's easy enough to use one document for the acronyms and to match them against one or more other documents, I don't really see the point of having the code delete entries from the acronym document just because terms found in one test document aren't found in another. If you process multiple documents, all that might lead to is a lot of churning (the same content repeatedly being deleted/added).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]