Final answer:
The data dictionary serves to offer detailed definitions and maintain uniformity in the usage of database elements, essential for clear communication among stakeholders.
Step-by-step explanation:
The purpose of the data dictionary is to provide comprehensive definitions and ensure consistency of use for the elements within a database system. It acts as a centralized repository of information about data such as meaning, relationships to other data, origin, usage, and format. The data dictionary is vital for various stakeholders including database administrators, developers, and analysts to understand the data structures, constraints, and dependencies, thus ensuring that everyone is on the same page regarding the database design and how data elements should be used and interpreted.