We all know the problem: We use the same term, but means two different things. Or: We use two different terms, but actually mean the same thing.
Within data management this is a huge challenge. The solution is ….. Well, there are different terms:
Business Glossary is one term. The term is explained in an artcle on B-eye-Network by Lowell Fryman here. Using the term business glossary implies that you have a business approach to the issue. Implementing a business glossary is often mentioned as a part of a data governance framework.
Data Dictionary is explained on Wikipedia here. Using the term data dictionary implies that you have a technical approach to the issue. Having a data dictionary is sometimes mentioned as a part of a Master Data Management (MDM) solution.
Metadata Repository is also explained on Wikipedia here. Using the term metadata repository implies that you have a somewhat nerdish approach to the subject as seen in the post Metadata Meatballs. Addressing metadata is often stated as an important subject within the data quality discipline as shown in the post Perfect Wrong Answer.